Explain why the skin appears tanned, or darker, after spending time in the sun
What will be an ideal response?
Melanin synthesis increases upon exposure to UV radiation from the sun or sunlamps. This leads to tanning, or darkening of skin pigmentation. UV radiation also damages the DNA of the melanocytes, which increases the production of additional melanin.
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About how many cells constitute the body of an adult?
A. 50 to 100 quadrillion B. 50 to 100 billion C. 50 to 100 million D. 50 to 100 trillion
The drug atropine influences the autonomic nervous system by
A) blocking the action of acetylcholine. B) stimulating the release of acetylcholine. C) stimulating the release of norepinephrine. D) blocking the action of norepinephrine.
Almost all sensory signals pass through which structure on the way to the cerebrum?
A. Corpora quadrigemina B. Thalamus C. Hypothalamus D. Corpus callosum E. Corticospinal tracts
Which term describes an exaggerated curvature of the lumbar vertebrae?
A. Scoliosis B. Kyphosis C. Hunchback D. Lordosis