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People had not yet seen their own blood cells.

Red blood cells.

Ribosomes help produce proteins, which are essential for the cell's structure and necessary for its survival.

Ribosomes are the sites of protein synthesis in the cell.

Chloroplasts are found only in plant cells; they trap energy from the Sun to make glucose, which is broken down in the mitochondria to power cell activities.

The nucleus controls all cell activities.

The endoplasmic reticulum is involved in the production and transport of proteins and lipids within the cell.

The cytoskeleton is a network of fibers that provides structural support and shape to the cell, and aids in cell movement.

The third idea of the Cell Theory refers to cell reproduction, indicating that all cells arise from pre-existing cells.

The cell membrane separates the inside of the cell from the external environment and controls the flow of materials in and out of the cell.

The cell membrane is a protective barrier that regulates what enters and exits the cell.

Cytoplasm includes the cytosol, organelles, and other life-supporting materials, all contained by the cell membrane.

The Golgi body sorts and packages proteins and other molecules for transport out of the cell.

Cytoplasm is the fluid material between the cell membrane and the nucleus, consisting of cytosol and specialized organelles.

Vacuoles are storage organelles that can hold various substances, including nutrients and waste products.

Cytoplasm is the gel-like substance within the cell membrane that contains organelles and is the site for many cellular processes.

The endoplasmic reticulum is a network of membrane-covered channels that transport materials made in the cell; it is connected to the nucleus.

The nucleus is the organelle that contains the cell's genetic material and controls cellular activities.

The Golgi body modifies, sorts, and packages proteins and lipids for secretion or delivery to other organelles.

Vacuoles contain water and other materials and are used to store or transport small molecules; plant cells tend to have one large vacuole; animal cells may have several smaller vacuoles.

Mitochondria are organelles that produce energy for the cell through cellular respiration.

A vesicle is a small membrane-bound sac that transports materials within the cell.

The second idea of the Cell Theory implies that to understand how living things function, one must know what is going on inside cells, as all body functions are designed to meet the needs of cells.

Vesicles are membrane-covered sacs that transport and/or store materials inside the cell and sometimes help these materials cross the cell membrane to enter or exit the cell.

Mitochondria are the organelles where energy is released from glucose to fuel cell activities.

The cell wall is a tough, rigid structure lying just outside a plant cell’s membrane; it provides support for the cell.

The cytoskeleton consists of filaments and tubules that provide a framework for the cell, helping it maintain its structure and providing 'tracks' along which vesicles and organelles can move.

That 'germs' cause diseases.

The smallest unit that can perform the functions of life.

Thousands of times.

Limited understanding with no knowledge of the microscopic world.

The science of using microscopes to view samples or objects.

It made it possible to introduce simple methods to prevent many diseases and increase the human life span.