The gaps between Schwann cells are indicated by ________
B
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A surface chemical that prevents microbial growth is
A. histamine. B. leukotriene. C. sebum. D. kinin. E. interferon.
A person with an endocrine disorder wants to know the difference between a hormone and a neurotransmitter. What should be explained to this person?
A. Hormones are released at synapses. B. Neurotransmitters affect a single cell, whereas hormones affect multiple cells. C. Hormones affect the target tissue immediately and very briefly. D. Neurotransmitters are released into the bloodstream.
A dense fibrous connective tissue layer that surrounds the entire skeletal muscle is the ________.
Fill in the blank(s) with the appropriate word(s).
Which of the following are pigments that contribute to skin color?
A) collagen; elastic; keratin B) melanin; jaundice; erythema C) sebum; sweat; urea D) melanin; carotene; hemoglobin