Question

1. Which of the following statements regarding capillary function is NOT correct?

a. Transcytosis of exchangeable proteins can occur.

b. Diffusion is the most common exchange mechanism.

c. Blood velocity through capillaries is very fast.

d. Capillary exchange in the CNS is tightly regulated. 2. All EXCEPT which of the following are thermoregulatory responses? a. chemoreceptor activity in response to increased levels of carbon dioxide b. Thermoreceptors send messages to the thermoregulatory center in the hypothalamus. c. thermoregulatory center activation d. baroreceptor reflex e. production of bradykinin

Answer 1

1. ANS: c. Blood velocity through capillaries is very fast.

Explanation:

Blood velocity through capillaries is very slow. The large total cross-sectional area of the capillaries is the primary cause of the low velocity of blood flow through capillaries.

2. ANS: e. production of bradykinin.

Explanation:

Bradykinin is an inflammatory mediator. It is a peptide that causes blood vessels to dilate (enlarge), and therefore causes blood pressure to fall.