quiz: nervous system
the role of the parasympathetic division of the autonomic nervous system is to
establish homeostasis after fight-or-flight response
dopamine, norepinephrine, and acetylcholine are all
neurotransmitters that excite or inhibit a neural signal across a synapse
which of the following is the correct sequence of the neural chain of events set in motion by an environmental stimulus?
receptors, afferent neurons, interneurons, efferent neurons, effectors
which of the following occurs when a neuron is stimulated to its threshold?
the movement of sodium and potassium ions across the membrane creates an action potential
neurotransmitters are typically stored in which of the following parts of a neuron?
the terminal buttons
reuptake of neurotransmitter refers to
absorption of the neurotransmitter into the terminal buttons of sending neruon
which of the following correctly describes the firing of neurons?
an all-or-none response
activation of the sympathetic branch of the autonomic nervous system results in
an increase in respiratory rate
curare blocks action at acetylcholine synapses and causes paralysis. this drug is an example of an
antagonist
the primary effect of the myelin sheath is to
increase the velocity of conduction of the action potential along the axon
