Which structures in capillary beds open to allow the capillaries to perfuse with blood?
A. Thoroughfare channels
B. Precapillary sphincters
C. Fenestrations
D. Postcapillary sphincters
E. Metarterioles
Answer: B
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The pulmonary veins
A. contain deoxygenated blood. B. leave the hilum at a slightly lower level than the bronchi and pulmonary arteries. C. are considered part of the systemic circulatory system. D. All of the above
In order to inhale, motor neurons stimulate the __________ to __________.
A. diaphragm; relax B. diaphragm; contract C. external intercostals; relax D. internal intercostals; contract
When the flexor muscles of one arm contract in a withdrawal reflex, the extensor
muscles of the other arm contract. This phenomenon is called A) crossed flexor reflex. B) crossed extensor reflex. C) flexor extensor reflex. D) ipsilateral reflex.
Match the vitamin with its function in the body.A. Required for the synthesis of clotting factors (prothrombin)B. Is a component of the coenzyme FADC. Promotes calcium and phosphorus useD. Involved in amino acid metabolismE. Primary constituent of coenzyme ARiboflavin
Fill in the blank(s) with the appropriate word(s).