Nicotinic receptors bind
A. acetylcholine and allow chloride ions to exit the cell.
B. acetylcholine and allow sodium ions to enter the cell.
C. muscarine and increase the contractility of intestinal muscle.
D. norepinephrine and can either stimulate or inhibit the cell.
E. norepinephrine and allow potassium entry, thereby exciting the cell.
B
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If the concentration of an endocrine ligand decreases, the target cell may insert more receptors into the cell membrane in an attempt to keep its response at a normal level, in a process known as ________.
Fill in the blank(s) with the appropriate word(s).
The amount of energy required for a reaction to take place is called
Activation energy Kinetic energy Chemical energy Enzymatic energy
Urinary continence is maintained by:
A. excitatory somatic innervation of the internal sphincter B. excitatory postganglionic parasympathetic innervation of the detrusor muscle C. excitatory postganglionic parasympathetic innervation of the internal sphincter D. excitatory postganglionic sympathetic innervation of the detrusor muscle E. excitatory postganglionic sympathetic innervation of the external sphincter
Which neuroglial cell produces myelin in the peripheral nervous system?
A) Schwann cell B) Oligodendrocyte C) Astrocyte D) Microglial cell