What is the advantage of the small diameter of capillaries?
A) It dampens the rise in pressure during ventricular systole.
B) It slows blood flow, allowing sufficient time for capillary exchange to occur.
C) It absorbs the pressure changes that occur during the cardiac cycle.
D) It allows the vessels to overcome the force of gravity without a need for valves.
E) It prevents the backflow of blood, improving venous return.
B) It slows blood flow, allowing sufficient time for capillary exchange to occur.
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Specific proteins in the membranes mediate movement of lipid-soluble molecules into cells.
Answer the following statement true (T) or false (F)
The rate and depth of breathing are affected by the following factors EXCEPT ________.
A. an increase in blood Ca2+ concentration B. changes of blood pH C. irritants in the respiratory tract D. an increase in body temperature
Both ________ and ________ are the regulators of effectors in most feedback loops.
A. neurotransmitters, enzymes B. hormones, nerve impulses C. enzymes, nerve impulses D. enzymes, hormones E. hormones, paracrines
Acidosis has what effect on the resting membrane potential of nerve cells?
A. It causes repolarization. B. It causes hyperpolarization. C. It causes depolarization above threshold. D. It causes depolarization below threshold.