Monocytes circulate in the blood and lymph until they find an infected tissue, then they become what type of cell?
a. B cell
b. T cell
c. macrophage
d. mast cell
c. macrophage
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__________ are electrically excitable cells that signal other cells by means of chemical messages. Fill in the blank(s) with the appropriate word(s)
. If too little carbon dioxide is moving out of the lungs,
a. bronchioles relax and widen. b. bronchioles constrict and narrow. c. alveoli relax. d. alveoli constrict. e. the diaphragm enters tetany.
Which of the following statements about the autonomic nervous system is NOT true?
A. The functions of the autonomic system are generally involuntary and subconscious. B. The sympathetic nervous system deals with "fight-or-flight" responses. C. The autonomic nervous system regulates the activities of cardiac and smooth muscle and glands. D. The parasympathetic nervous system promotes actions associated with relaxation. E. The neurotransmitter associated with the parasympathetic system is norepinephrine.
The membrane around the outside of all bones is the _____
pericardium parietal pleura mucous periosteum