action potentials

action potentials

which of the following statements about action potentials is false?

A.When an action potential reaches the end of the axon, it can cause either an excitatory or inhibitory response in the post-synaptic neuron.

B.When an action potential reaches the end of the axon, it will travel down all terminal branches.

C.When an action potential reaches the end of the axon, it causes the release of neurotransmitters from the terminals.


D.When an action potential reaches the end of the axon, it will only travel down one terminal branch because the signal is not strong enough to travel down all branches.


GABA-A receptors bind the neurotransmitter GABA (gamma-amniobutyric acid) and are made up of a Cl- ion channel that opens when GABA is bound. This is an example of a(n) _______________ receptor


A. muscarinic

B. cholinergic

C. ionotropic

D. metabotropic


Which of the following is an example of temporal summation

A.A neuron is unable to fire an action potential because it receives an IPSP from a neighboring neuron.

B.A neuron is does not fire an action potential because the input from a neighboring neuron is too far away from the axon hillock.

C.A neuron fires an action potential after receiving a single EPSP from several neighboring neurons.

D.A neuron fires an action potential after receiving a sudden burst of many EPSPs from a neighboring neuron.


Which of the following is an example of an endogenous ligand


A. A metabotropic receptor


B. Acetylcholine, a neurotransmitter


C. Nicotine, an acetylcholine receptor agonist

D. Bungarotoxin, an acetylcholine receptor antagonist found in snake venom


Acetylcholine is involved in which of the following nervous system functions?


A. Skeletal muscle control


B.  Sympathetic nervous system control


C.  Learning and memory


D. All of the above



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