Exposure to sunlight stimulates the production of ________.
A. more skin cells
B. vitamin D
C. melanin
D. melanin and vitamin D
Answer: D
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A CT scan differs from a conventional X-ray image because it is
A) two-dimensional. B) safer. C) four-dimensional. D) three-dimensional.
Fluid movement in the cochlea causes
a. displacement of the round window, which dissipates pressure. b. deflection of the basilar membrane. c. the hairs of the receptor cells of the organ of Corti to be bent as they are moved in relation to the tectorial membrane. d. two of these answers. e. all of these answers.
The germinal layer of the epidermis contains pigment granules that are responsible for skin:
A. color. B. texture. C. moisture. D. temperature.
Water moves back and forth across the plasma membrane by the process of
A. osmosis. B. filtration. C. facilitated diffusion. D. active transport. E. endocytosis.