Neuroscience

Q: The "all-or-nothing event" refers to the fact that

(a) :  nerve cells are continuously active.
(b) :  action potentials occur completely or not at all.
(c) :  an electrical current crosses the synapse completely or not at all.
(d) :  all the neurons in a particular "lobe" of the brain fire or none of them fire.
(e) :  None of the Above
Answer:  action potentials occur completely or not at all.
Explanation:  

Q: The "emergency" part of the nervous system that prepares the body for "fight or flight" is the __________ branch.

(a) :  sympathetic
(b) :  parasympathetic
(c) :  central
(d) :  peripheral
(e) :  None of the Above
Answer:  sympathetic
Explanation:  

Q: Muscles can contract because they are made up of

(a) :  motor neurons.
(b) :  effector cells.
(c) :  connector neurons.
(d) :  sensory neurons.
(e) :  None of the Above
Answer:  effector cells.
Explanation:  

Q: The microscopic space between two neurons is called a(n)

(a) :  enkephalins.
(b) :  acetylcholine.
(c) :  catecholamine.
(d) :  synapse.
(e) :  None of the Above
Answer:  synapse.
Explanation:  

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