The portion of a hair that protrudes above the surface of the skin is the
A. hair root.
B. hair follicle.
C. hair shaft.
D. hair bulb.
E. dermal papilla.
C
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The effects of aging on the brain begin at about ________ of age.
A. 30 years B. 50 years C. 40 years D. 20 years E. 60 years
Capillaries that have a complete lining are called
A) continuous capillaries. B) fenestrated capillaries. C) sinusoidal capillaries. D) sinusoids. E) vasa vasorum.
Lack of sunlight will directly affect the formation of vitamin D. This implies that the specific cell type required for vitamin D synthesis using sunlight energy is the ___________.
a) keratinocyte b) chondroblast c) intestinal epithelial cell d) osteocyte
Which of the following statements concerning blood vessel walls is true?
A. The tunica adventitia is composed of smooth muscle and endothelium. B. Capillaries have both a tunica intima and a tunica media. C. The tunica intima is the innermost layer of a blood vessel wall. D. The tunica media is found in all blood vessels except veins. E. Vessel diameter is controlled primarily by the tunica intima.