The main function of leukocytes is to
A. carry oxygen through the blood.
B. defend against pathogens.
C. form clots.
D. trigger allergies.
E. carry carbon dioxide through the blood.
Answer: B
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Which vessel(s) do(es) not return blood from the myocardium to the right atrium?
A. Great cardiac vein B. Thebesian veins C. Left marginal branch D. Posterior interventricular vein E. Coronary sinus
The sympathetic nervous system releases ACh at the neuroeffector synapse of
A) digestive glands. B) blood vessels in skeletal muscles. C) cardiac muscle. D) smooth muscles. E) All of the answers are correct.
Define expiration
What will be an ideal response?
The major function of the arterioles is to
a. regulate flow of blood through capillary beds b. distribute the cardiac output to tissues c. serve as a pressure reservoir d. convert the intermittent flow from the heart to a steady outflow e. perform functions a and b