Why does the skin of a light-skinned person appear red during exercise in hot weather?
What will be an ideal response?
When the skin gets warm, arriving oxygenated blood is diverted to the superficial dermis (papillary layer) to eliminate heat. The oxygenated blood imparts a reddish coloration to the light skin.
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Which of the following fibers of the ANS are adrenergic?
A. Sympathetic preganglionic fibers B. Sympathetic postganglionic fibers C. Somatic preganglionic fibers D. Parasympathetic preganglionic fibers E. Parasympathetic postganglionic fibers
Which of the following is (are) a mineralocorticoid?
A) thyroxine B) ADH C) cortisol D) androgens E) aldosterone
Veins are much more easily distended under pressure than are arteries
A) only in a few specialized cases. B) because their walls are thinner and contain a lower proportion of smooth muscle fibers. C) because their walls are thicker, and veins contain a greater proportion of elastic fibers and collagen. D) because of vasoconstriction. E) None of the answers are correct.
The sciatic nerve is really two nerves, the tibial nerve and the
A) common fibular nerve. B) femoral nerve. C) obturator nerve. D) coccygeal plexus.