Parasympathetic stimulation reduces heart rate
Indicate whether the statement is true or false
TRUE
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In a neuromuscular junction, the effect of acetylcholine (ACh) binding to receptors on the motor end plate lasts only briefly due to
a) rapid uptake of the ACh into the myofiber. b) endocytosis of the ACh receptor into the myofiber. c) rapid destruction of ACh in the synaptic cleft by acetylcholinesterase. d) rapid destruction of ACh in the synaptic cleft by monoamine oxidase. e) diffusion of the ACh out of the synaptic cleft.
All of the following are typical characteristics of neurotransmitters except ________
A) they are released into the bloodstream before reaching the postsynaptic cell B) they are released in response to stimulation C) they alter the physiology of the postsynaptic cell D) they bind to specific receptors on the postsynaptic cell E) they are synthesized by a presynaptic neuron
The four taste sensations are:
a. sweet, salty, fruity, bitter b. sweet, salty, bitter, sour c. sweet, sour, fruity, salty d. sweet, fruity, bitter, sour
What type of immune defense cell is selectively invaded by AIDS virus?
a. cytotoxic T cells b. helper T cells c. suppressor T cells d. macrophages e. neutrophils