The chemical curare is a nicotinic receptor antagonist. How will curare affect skeletal muscle function?
A. It activates an autoimmune disease that destroys myelin.
B. It will cause spastic paralysis (sustained, unwanted muscle contraction).
C. It will cause persistent twitches with short periods of rest in between.
D. It will cause flaccid paralysis (no muscle contraction possible).
E. Muscle function is fine, but it will cause a loss of voluntary control.
Answer: D
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The statement "Its postganglionic axons always use acetylcholine as the neurotransmitter" is
A) true only for the parasympathetic nervous system. B) true only for the sympathetic nervous system. C) true for both the parasympathetic and sympathetic nervous systems. D) not true for either the parasympathetic or sympathetic nervous systems. E) true only for the somatic nervous system.
Interaction with a membrane-bound receptor will transduce the hormonal message via __.
A. depolarization B. direct gene activation C. a second messenger D. endocytosis
An acid is a molecule that releases (donates) ________
A) protons (hydrogen ions) B) hydroxyl ions C) neutrons D) electrons
A midcoronal plane runs crosswise through the body at right angles to the sagittal plane, dividing the body into superior and inferior parts.
Answer the following statement true (T) or false (F)