What is the basic structural unit of collagen fibrils?
Click to see answer
Tropocollagen
Click to see question
What is the basic structural unit of collagen fibrils?
Tropocollagen
What type of connective tissue is the lamina propria classified as?
Loose irregularly arranged connective tissue.
What are the main components of the lamina propria?
Fiber and cell.
What is the primary function of connective tissue fibers?
To strengthen and support the tissue.
What is the property of elastin molecules in connective tissue?
The network of elastin molecules can stretch and recoil like a rubber band.
What are the main types of fibers found in fibrous connective tissue?
Collagen fibers, reticular fibers, and elastic fibers.
What is the origin of mesenchymal cells?
Mesodermal origin
What type of connective tissue is the ligamentum flavum?
Dense regularly arranged connective tissue of the elastic type.
What are the non-living elements of connective tissue?
The non-living elements include intercellular substance and extracellular matrix, which can exist in fluid to solid states.
What is the diameter range of elastic fibers?
0.1 - 2 μm
What is the role of heparin/chondroitin sulfate in connective tissue?
Heparin/chondroitin sulfate acts as an anticoagulant, found in cells at the dermis and submucosa, and helps inactivate histamine.
What is the shape of mesenchymal cells?
Irregular stellate shape
What type of cell is primarily responsible for producing collagen fibers?
Fibroblast.
What is the core composition of elastic fibers?
An elastin core surrounded by microfibrils
What is the primary function of elastic fibers in connective tissue?
Elastic fibers provide elasticity and resilience, allowing tissues to return to their original shape after stretching.
Where is histamine primarily found in connective tissue?
Histamine is found in cells at the mucosa and is involved in local inflammation during allergic reactions.
What are the three main components of connective tissue?
The three main components are fibrous form (protein fibers), amorphous form (ground substance), and water (tissue fluid).
What feature do mesenchymal cells have for networking?
Cell process for networking with adjacent cells
What results from variations in the amino acid sequence of the α-chain in collagen?
Different properties of the collagen chains.
What are the three primary germ layers?
Ectoderm, Mesoderm, Endoderm
How much can elastic fibers stretch?
Up to 1.5 times their length
What staining characteristic is associated with histamine in H&E?
Histamine exhibits acidophilic staining in H&E preparations.
What are CNT cells?
CNT cells, or connective tissue progenitor cells, are cells that give rise to various types of connective tissue.
Who primarily produces the extracellular matrix in connective tissue?
The extracellular matrix is mostly produced by connective tissue cells, except for blood plasma.
What are the main components of elastic fibers?
Elastic fibers are primarily composed of elastin and microfibrils, which contribute to their stretchability.
What are the non-living elements of connective tissue?
Intercellular substance and extracellular matrix.
What triggers exocytic degranulation of mast cells?
Exocytic degranulation of mast cells is triggered by the binding of IgE to receptors on the cell surface, leading to local inflammation.
Where are elastic fibers present in the body?
In ligamentum nuchae, ligamentum flavum, lung, skin, bladder, and walls of blood vessels
What is a melanosome?
A melanosome is a membrane-bound organelle responsible for the synthesis, deposit, and transportation of melanin.
Describe the nucleus of mesenchymal cells.
Large round/oval nucleus with pale staining (fine chromatin) and a prominent nucleolus
What are α-chains combined to form in connective tissues?
Various types of collagen.
What are the components of the ectoderm?
Surface ectoderm, Neural tube, Neural crest cell
What is the significance of mesenchyme in the embryo?
Mesenchyme is a type of embryonic connective tissue that plays a crucial role in the development of various tissues and organs.
What is the significance of toluidine blue staining in relation to heparin?
Toluidine blue staining shows metachromasia, where heparin changes color from magenta to purple.
Which stains are used for elastic fibers?
Verhoeff's elastic stain and Weigert's elastic stain
What are the characteristics of elastic fibers?
Thin, branched, and wavy; they allow for stretch and recoil.
What characterizes loose irregularly arranged connective tissue?
It has a higher number of cells compared to fibers, with a loose arrangement.
What are the living elements of connective tissue?
Connective tissue cells (CNT cells).
What are the locations where collagen fibers can be found?
Collagen fibers are found in the mesentery spread, dermis of the skin, and tendons.
In which types of connective tissue are elastic fibers commonly found?
Elastic fibers are commonly found in elastic connective tissue, such as in the walls of large arteries, lungs, and certain ligaments.
What occupies the space between the cells and fibers in connective tissue?
Ground substance occupies the space between the cells and fibers.
What is loose irregularly arranged connective tissue?
Loose irregularly arranged connective tissue is a type of connective tissue characterized by a loose arrangement of fibers and cells, providing flexibility and support to surrounding structures.
What factors influence the pigmentation spectrum?
The pigmentation spectrum depends on the stage of melanosome, rate of degradation, and number of melanosomes, but not on melanocyte density.
How does the cytoplasm of mesenchymal cells appear?
Pale cytoplasmic basophilic staining
What is loose irregularly arranged connective tissue?
Loose irregularly arranged connective tissue is a type of connective tissue characterized by a loose arrangement of fibers and cells, providing flexibility and support to surrounding structures.
What are the four types of adult basic tissues?
Epithelial tissue, Nervous tissue, Connective tissue, Muscular tissue
What staining method is commonly used to visualize connective tissue in histology?
Hematoxylin and eosin (H&E) staining is commonly used to visualize connective tissue in histological sections.
What types of proteins do melanosomes carry?
Melanosomes carry a protein scaffold for melanin deposit and enzymes involved in melanin biosynthesis.
What type of connective tissue is a tendon classified as?
Dense regularly arranged connective tissue.
What are plasma cells derived from?
B-lymphocytes as antibody-producing cells.
What are the non-living elements of connective tissue?
Intercellular substance and extracellular matrix.
What is the shape of a reticular cell in a lymph node?
Large stellate shape.
How are melanosomes transferred to other cells?
Melanosomes are transferred to other cells by phagocytosis.
What is a key cellular component found in tendons?
Nucleus of fibroblast.
Where are plasma cells rarely found in connective tissue?
In the mucosa and serosa of the GI tract, mammary gland, reticular connective tissue of tonsil/lymph node, and chronic inflammation connective tissue.
What are the types of fibers found in loose irregularly arranged connective tissue?
Collagen, reticular, and elastic fibers.
What is the structure of reticular fibers?
Thin and highly branched.
What are the living elements of connective tissue?
Connective tissue cells (CNT cells).
What type of nucleus do reticular cells have?
Large oval nucleus with pale staining.
What is the primary function of fibroblasts in connective tissue?
Fibroblasts are modified mesenchymal cells responsible for producing fibers and ground substance for the extracellular matrix (ECM).
What type of connective tissue is characterized by dense, regularly arranged fibers?
Dense regularly arranged connective tissue of the elastic type.
In which tissues can plasma cells be found?
Palatine tonsil, lymph node, and bone marrow smear.
What is a multinucleated giant cell?
A multinucleated giant cell is formed by the fusion of multiple macrophages encircling a large foreign body, characterized by incomplete cytoplasmic division.
What is the appearance of an inactive macrophage compared to a fibroblast?
An inactive macrophage has a small round nucleus with dark staining, similar to a fibroblast.
Which cells are present in loose irregularly arranged connective tissue?
Fibroblast, macrophage, mast cell, and white blood cell.
What is the function of reticular fibers?
They form supportive networks.
What is a characteristic feature of the cytoplasm of reticular cells?
Fine granular cytoplasm with pale staining.
What is the primary germ layer from which connective tissue is derived?
Mesoderm
What type of fibers are primarily found in dense irregularly arranged connective tissue?
Primarily irregular collagen fibers and some elastic fibers.
What are the two stages of fibroblasts?
The two stages of fibroblasts are the active/young fibroblast and the inactive/adult fibroblast (fibrocyte).
In what type of section is dense regularly arranged elastic connective tissue typically observed?
Long section.
What is the primary component of the ligamentum nuchae?
Elastic fibers are the primary component of the ligamentum nuchae.
What is dense irregularly arranged connective tissue?
A type of connective tissue that provides strength and support in multiple directions due to its irregular arrangement of collagen fibers.
What is the primary pigment produced by pigmented cells in the skin?
Melanin
What type of fat is associated with adipose cells that can transition between white and brown fat?
Beige fat
How do multinucleated giant cells form?
They form through the fusion of more than one macrophage, often in response to a large foreign body.
How does an active macrophage differ from an inactive macrophage?
An active macrophage is larger, has an overt nucleus, and contains phagocytic vacuoles/granules.
Where is loose irregularly arranged connective tissue located?
Beneath the skin and around blood vessels, muscles, and nerves.
Which technique is used to visualize reticular fibers?
Silver impregnation technique.
What do reticular cells produce?
Reticular fibers with phagocytic properties.
What is the primary structural protein found in connective tissue?
Collagen fiber
What is a modified fibroblast that has contractile properties?
Myofibroblast
What is the main function of connective tissue?
To support, bind, and protect other tissues and organs.
What is the major cell type in dense irregularly arranged connective tissue?
Fibroblast.
What is the structure of tropocollagen?
Tropocollagen is a triple helix that is 300 nm long and 1.5 nm thick.
How do fibroblasts move within the connective tissue?
Fibroblasts exhibit slow gliding movement, which can be observed during inflammation or healing.
What type of connective tissue is characterized by the presence of elastic fibers?
Elastic connective tissue is characterized by the presence of elastic fibers.
What process is responsible for the production of melanin in pigmented cells?
Melanin biosynthesis
What characterizes dense regularly arranged connective tissue (collagenous type)?
It is characterized by tightly packed collagen fibers arranged in a parallel fashion, providing tensile strength in one direction.
Who conducted research on beige fat published in Science in 2010?
Ishibashi & Seale
What are the two types of fibroblasts found in connective tissue?
Active and inactive fibroblasts.
What are the different orientations of collagen fibers observed in skin slides?
Collagen fibers can be observed in cross cut, oblique, and longitudinal orientations.
What is the shape of a plasma cell?
Oval, round, or irregular shape (smaller than macrophage but larger than lymphocyte).
How do reticular cells interact with adjacent cells and fibers?
Through cell process networking.
What type of connective tissue is characterized by the presence of collagen fibers?
Connective tissue proper
What intracellular structures do myofibroblasts contain that contribute to their contractile properties?
Intracellular actin filaments and dense bodies
What are the two main types of connective tissue?
Loose connective tissue and dense connective tissue.
Where is dense irregularly arranged connective tissue commonly located?
In fibrous capsules and the dermis of the skin.
What is the diameter range of collagen fibrils?
Collagen fibrils have a diameter range of 20-100 nm.
What is a key characteristic of fibroblasts regarding regeneration?
Fibroblasts have the capability for regeneration through mitotic division.
What are the types of loose connective tissue?
Mesenchyme, Mucous connective tissue, Adult areolar connective tissue, Pigmented connective tissue, Adipose connective tissue, Reticular connective tissue.
What are reticular fibers?
Reticular fibers are thin, branched fibers made of collagen that form a network to support the cells in various tissues.
What is the primary function of beige fat in the body?
To generate heat and regulate energy expenditure, similar to brown fat.
What is dense regularly arranged connective tissue (elastic type)?
A type of connective tissue that contains elastic fibers arranged in a parallel manner, allowing for flexibility and resilience.
What is the primary function of connective tissue?
Connective tissue functions as a supporting part among body structures, providing anchorage, separation, support, and fastening.
What is the primary function of fibroblasts in connective tissue?
Fibroblasts are responsible for the synthesis of collagen and other extracellular matrix components.
Which cells are primarily found in the connective tissue of the skin?
Fibroblasts are the primary cells found in the connective tissue of the skin.
What type of connective tissue is a tendon classified as?
Collagenous type
Describe the nucleus of a plasma cell.
Small eccentric nucleus with a large central nucleolus.
What role do collagen fibers play in connective tissue?
They provide strength and support.
What role do myofibroblasts play in wound healing?
They form granulation tissue, which leads to scar formation.
What is ground substance in connective tissue?
Ground substance is the non-cellular material found in the extracellular matrix of connective tissue, providing a medium for the exchange of nutrients and waste between blood and cells.
What are reticular fibers primarily composed of?
Reticular fibers are mainly composed of type III collagen with a carbohydrate.
What are the primary functions of mesoderm connective tissue?
Structural support, flexibility, storage, circulatory support, defense, strength, and contractile support.
What is the diameter range of collagen fibers?
Collagen fibers have a diameter range of 1-20 μm.
What is the major cell type in elastic connective tissue?
The major cell type is fibroblast.
What type of cells are the most common in connective tissue?
Fibroblasts are the most common cells in connective tissue.
How is dense connective tissue classified?
Dense connective tissue is classified into regularly arranged and irregularly arranged.
What is the primary function of reticular fibers?
The primary function of reticular fibers is to provide structural support and a framework for cells in organs such as the liver, lymph nodes, and bone marrow.
In which organ was the study of fibroblast and collagen conducted according to the text?
Monkey bladder.
From what embryonic layer is most connective tissue derived?
Most connective tissue is derived from mesenchyme.
What is the primary structural protein found in connective tissue?
Collagen fiber
What are the two main layers of the skin?
The two main layers of the skin are the epidermis and the dermis.
What is a histiocyte derived from?
Monocyte
What type of connective tissue is the ligamentum nuchae classified as?
Elastic type
เอกสารนี้ใช้เพื่ออะไร?
เอกสารนี้ใช้ประกอบการเรียนการสอนในห้องบรรยายเพื่อประกอบความเข้าใจตามหลักสูตรแพทยศาสตร์.
What is the appearance of chromatin in a plasma cell?
Coarse chromatin granules with alternating distribution of dark heterochromatin and light euchromatin, located near the nuclear membrane (cart-wheel/clock-face appearance).
What type of fibers are primarily found in dense regularly arranged connective tissue?
Parallel collagen fibers and a few elastic fibers.
What is the size range of reticular fibers?
Reticular fibers range from 100-150 nm.
What are the main components of ground substance?
The main components of ground substance include glycosaminoglycans (GAGs), proteoglycans, and glycoproteins.
What are the two types of embryonal connective tissue?
Mesenchymal connective tissue and mucous connective tissue.
Which types of support are provided by adipose tissue?
Storage support.
What are the two main classifications of connective tissue?
Embryonal connective tissue and Adult/Mature connective tissue.
What type of fibers are found in high proportion in elastic connective tissue?
Elastic fibers.
What are the types of cells found in connective tissue?
Pigmented cells (melanocyte and melanophore), fibroblast, macrophage, mast cell, plasma cell.
What are the two types of adipose cells?
Unilocular (yellow/white fat cell) and Multilocular (brown fat cell).
What are the resident type connective tissue cells?
Resident type connective tissue cells are developed and function in connective tissue, including fibroblasts, reticular cells, mast cells, plasma cells, fixed macrophages, adipose cells, and pigmented cells.
In which type of connective tissue are reticular fibers commonly found?
Reticular fibers are commonly found in loose connective tissue, particularly in reticular connective tissue.
What are the special types of connective tissue?
Cartilage, Bone, Hematopoietic tissue (Blood).
What are the roles of connective tissue in the body?
Connective tissue serves to anchor, separate, support, and fasten body structures, providing protection and flexibility.
What type of connective tissue is characterized by the presence of collagen fibers?
Dense connective tissue
What is mesenchyme and where is it found?
Mesenchyme is a precursor tissue for most adult connective tissue and mucous connective tissue, found in early embryonic life between ectoderm and endoderm.
Where are histiocytes commonly found?
In loose connective tissue with a comparable amount to fibroblasts
What type of connective tissue is found in the dermis?
The dermis contains dense irregularly arranged connective tissue.
ใครห้ามนำเอกสารนี้ไปใช้?
ห้ามผู้ใดนำไปใช้ในวัตถุประสงค์อื่น.
What type of cytoplasm does a plasma cell have?
Basophilic cytoplasm, mainly consisting of rough endoplasmic reticulum (RER).
What is the major cell type in dense regularly arranged connective tissue?
Fibroblast.
What are Glycosaminoglycans (GAG)?
Long unbranched polysaccharides such as Hyaluronic acid, Chondroitin sulfate, Heparan sulfate, Heparin, Dermatan sulfate, and Keratan sulfate.
What type of connective tissue is the ligamentum flavum classified as?
Elastic type
What type of connective tissue is involved in immunity?
Hematopoietic tissue.
What role do reticular fibers play in tissues and organs?
Reticular fibers form a fine meshwork that acts as a supporting structure in tissues and organs such as the liver, bone marrow, and lymphatic organs.
What role does ground substance play in connective tissue?
Ground substance plays a crucial role in supporting cells, providing a medium for nutrient exchange, and influencing the mechanical properties of the tissue.
What are the general properties of adult connective tissue proper?
It includes loose irregularly arranged connective tissue and dense connective tissue.
Where is elastic connective tissue commonly located?
In the ligamentum flavum, ligamentum nuchae, and large arteries.
What types of embryonal connective tissue are there?
Mesenchyme and Mucous connective tissue.
What type of fibers are present in the extracellular matrix of connective tissue?
Collagen fibers (either loose or dense connective tissue).
What is the role of transient type connective tissue cells?
Transient type connective tissue cells are developed in bone marrow and are transferred by circulation to function in connective tissue, wandering between circulation and connective tissue.
What is the primary function of modified mesenchymal cells in adipose tissue?
Energy storage, hormone secretion, and cushioning.
What is the role of collagen fibers in connective tissue?
They provide strength and support.
What type of activity do histiocytes perform?
Phagocytic activity (cell debris & foreign body) by pseudopodium
What are the characteristics of mesenchyme?
Mesenchyme is highly vascularized, contains mesenchymal cells, and has an extracellular matrix that includes fluid with chondroitin and rarely mature fibers.
Where is dense regularly arranged connective tissue typically located?
In tendons and ligaments.
Which connective tissues provide strength?
Bone, cartilage, ligament, and tendon.
What are Proteoglycans?
Core proteins with glycosaminoglycan (GAG) chains attached.
หากฝ่าฝืนจะมีผลอย่างไร?
อาจมีความรับผิดตามพระราชบัญญัติลิขสิทธิ์.
What are the types of dense connective tissue?
Dense irregularly arranged connective tissue and dense regularly arranged connective tissue.
What is found near the nucleus of a plasma cell?
A clear area near the nucleus, which contains the Golgi apparatus and centrosphere.
What is the characteristic arrangement of dense regularly arranged connective tissue?
It is densely packed and organized in a regular pattern.
What type of connective tissue is characterized by dense regularly arranged elastic fibers?
Elastic connective tissue.
What are the two types of embryonal connective tissue?
Mesenchymal connective tissue and mucous connective tissue.
What technique is used to visualize reticular fibers?
Reticular fibers can be visualized using the argyrophilic fiber technique (silver impregnation technique).
How does ground substance affect the properties of connective tissue?
Ground substance affects the viscosity, elasticity, and overall mechanical properties of connective tissue, influencing its function and resilience.
Can you name some examples of transient type connective tissue cells?
Examples of transient type connective tissue cells include neutrophils, eosinophils, monocytes, lymphocytes, free macrophages, and mesenchymal cells.
Where can connective tissue be found in the body?
In the iris, choroid, and leptomeninges.
What are the types of adult connective tissue proper?
Loose/areolar connective tissue, Dense connective tissue (regularly and irregularly arranged), Reticular connective tissue, Adipose tissue, and Pigmented connective tissue.
What characteristic appearance do unilocular adipose cells have?
Signet ring appearance.
What is the size range of collagen fibers?
1-20 μm
What are the five most common types of collagen?
Type I: dermis, tendon, ligament, bone, dentin, fibrocartilage, and capsule of organ; Type II: hyaline cartilage; Type III: reticular fibers; Type IV: basement membrane; Type V: placenta.
What are the main types of collagen fibers?
Type I, Type II, Type III, and Type IV collagen.
What is the role of pseudopodia in histiocytes?
They assist in phagocytosis and antigen presentation.
What are the basic structures of connective tissue?
The basic structures of connective tissue include both cellular components (like fibroblasts) and intercellular components (like the extracellular matrix).
What role does mesenchyme play in development?
Mesenchyme serves as a precursor tissue for the development of most adult connective tissue and is crucial for blood system development.
What are the two types of embryonal connective tissue?
Mesenchyme and Mucous connective tissue.
What is the first step in collagen synthesis?
Transcription: DNA is converted to mRNA.
What type of connective tissue is characterized by dense, regularly arranged collagenous fibers?
Dense regularly arranged connective tissue.
What are Glycoproteins?
Proteins with oligosaccharide chains attached to polypeptide side-chains.
What role does muscle tissue play in connective tissue?
It provides contractile support through intracellular fibers.
Do plasma cells have cytoplasmic secretory granules?
No, they do not have cytoplasmic secretory granules due to immediate exocytosis after synthesis.
What are some special properties of adult connective tissue?
Reticular connective tissue, adipose connective tissue, and pigmented connective tissue.
What is the process of converting procollagen to tropocollagen?
Enzymatic cleavage by procollagen peptidase.
What are the general properties of adult connective tissue?
It includes loose irregularly arranged connective tissue and dense connective tissue.
Why is the dermis considered controversial as pigmented tissue?
Due to the presence of dermal melanocyte.
What are the characteristics of an active fibroblast?
Active fibroblasts are large, flattened, spindle-shaped cells with branching (stellate), a pale oval nucleus (euchromatin) with 1-2 overt nucleoli, and moderately stained basophilic cytoplasm due to rough endoplasmic reticulum (RER). They have RER, Golgi apparatus, and elongated mitochondria in the perinuclear area and cell processes.
What are the special types of adult connective tissue?
Cartilage, Bone, and Hematopoietic tissue/Blood.
What is a key feature of cytoplasmic fat droplets in adipose cells?
They are used for energy storage.
How are collagen fibers characterized in terms of their structure?
They form bundles of various sizes, are long and unbranched.
What are the two types of adipose tissue?
White/Yellow storage fat and Brown thermogenic fat.
How many types of collagen have been identified?
Twenty-eight types of collagen have been identified and described.
What types of lysosomes are present in histiocytes?
Primary lysosome, secondary lysosome, and tertiary lysosome.
How do embryonal and adult connective tissue differ?
Embryonal connective tissue is primarily involved in development and includes structures like mesenchyme, while adult connective tissue is more specialized and includes types like loose and dense connective tissue.
