Which substance is known to increase capillary permeability?
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Histamine is a well-known mediator that increases capillary permeability, allowing for the movement of fluids and proteins into surrounding tissues during inflammatory responses.
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Which is FALSE for the prothrombin time?
a. it assesses the extrinsic pathway of the blood coagulation cascade
b. it is prolonged in patients with deficient fat absorption
c. it is increased by heparin
d. it may be restored to normal by the administration of vitamin K
e. it is about 15 -20 seconds
E
The amount of oxygen that diffuses into the blood/minute depends on:
a. oxygen pressure gradient
b. total functional surface area of the alveolar-capillary membrane
c. alveolar ventilation
d. none of the above
e. all of the above
E
Receptive relaxation:
a. is an example for cardiac reflex.
b. occurs in the small intestine.
c. will persist even if the vagus nerve is cut.
d. occurs in the heart during diastole.
e. none of the above is true
C
Which patient has the highest minute ventilation?
a. Tidal volume = 1000 ml; Frequency = 9 breaths/min; Dead space volume = 150 ml
b. Tidal volume = 600 ml; Frequency = 15 breaths/min; Dead space volume = 150 ml
c. Tidal volume = 500 ml; Frequency = 18 breaths/min; Dead space volume = 150 ml
d. Minute ventilation is the same in all cases.
e. It can not be calculated from the above data.
D
