The cells that respond to environmental stimuli are ________
Fill in the blank(s) with correct word
neurons
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The left renal vein, right renal vein, right suprarenal vein, and right gonadal vein merge directly into the
A. superior vena cava. B. great saphenous vein. C. inferior vena cava. D. obturator vein. E. common iliac vein.
Which neurotransmitter is released at the post-ganglionic synapse of parasympathetic nerves?
a. acetylcholine b. epinephrine c. dopamine d. mu
Answer the following statements true (T) or false (F)
1. Schwann cells are the primary type of glial cell associated with the central nervous system. 2. The gaps between Schwann cells are calledsynapses. 3. An influx of Na+ ions depolarizes the membrane of an axon. 4. The absolute refractory period is important in unidirectional propagation of action potentials. 5. If the graded potential increases in amplitude, then the frequency of the action potentials fired also increases.
Each of the following factors would increase peripheral resistance except
A) increased sympathetic stimulation. B) elevated levels of epinephrine. C) vasodilation. D) irregularities in the vessel walls caused by plaques. E) elevated hematocrit.