The fact that the epidermis is waterproof allows the skin to perform what function?
A. Water retention
B. Vitamin D production
C. Nonverbal communication
D. Sensation
Answer: A
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The period during which an excitable membrane can respond again, but only if the stimulus is greater than the threshold stimulus, is the ________ period
A) relative refractory B) absolute refractory C) resting D) lag E) stationary
The first branches of the aorta are the
A. brachiocephalic arteries. B. common carotid arteries. C. right and left pulmonary arteries. D. right and left subclavian arteries. E. right and left coronary arteries.
There are ________ pulmonary veins
A) 2 B) 4 C) 6 D) 8 E) 12
Why does hair turn gray or white as people age?
A. Keratin production decreases. B. Melanocytes die out. C. The shaft becomes rounder in cross-section. D. Mitosis slows down in the hair shaft. E. Blood supply to the scalp diminishes.