PNB 2774 - EXAM 2 Questions All
Solved Correctly 2026.
what is the neuromuscular junction? - Answer synapse between a motor neuron and a
muscle fiber
list and define the key components of the PRE-synaptic NMJ: (Mom Said Axl Volunteered Apple
Seeds) - Answer 1) motor neuron terminal - end of neuron neurotransmitter-filled synaptic
vesicles
2) synaptic vesicles - Ach storage
3) axon terminal - end of neuron close to muscle fiber
4) voltage gated Ca2+ channels - allow Ca into neuron upon A.P.
5) action potential - signal that triggers neurotransmitter release
6) synaptic cleft - space between neuron terminal and muscle fiber membrane
1) motor neuron terminal - Answer end of neuron that contains synaptic vesicles filled with
ACh neurotransmitters
2) synaptic vesicles - Answer ACh storage
3) axon terminal - Answer end of axon that is close to muscle fiber
4) voltage gated calcium channels - Answer open upon AP, resulting in calcium influx (into the
cell)
calcium is more concentrated on the ______ of the cell - Answer outside
5) action potential - Answer a strong and quick electrical charge that travels down an axon
6) synaptic cleft - Answer space between axon and cell
list and define the key components of the POST-synaptic NMJ: (Mom Asked Ally & Sara To Sing
To Mother Mary) - Answer 1) motor end plate - special region of muscle fiber membrane rich
w ach receptors
2) ach receptors - proteins in motor end plate that bind to ach, resulting in depolarization of
muscle fiber membrane
3) acetylcholinesterase (AChE) - enzyme that breaks down Ach, terminating A.P.
, 4) sarcolemma - muscle cell that contain motor end plate & creates muscle fiber electrical signal
5) t-tubules - folding back of sarcolemma that enhances A.P. deep into fiber
6) sarcoplasmic reticulum - specialized E.R that stores and releases Ca in response to
depolarization (A.P.)
7) troponin/tropomyosin - regulatory proteins that control myosin/actin binding during muscle
contraction
8) myosin/actin filaments - proteins in muscle fibers that interact to contract muscle
9) motor unit - single motor neuron & all muscle fibers it innervates
1) motor end plate (Mom) - Answer specialized region of muscle fiber lined with ACh
receptors
2) acetylcholine receptors (Asked) - Answer proteins binding to ACh, resulting in
depolarization of muscle membrane
3) acetylcholinesterase (AChE) (Ally) - Answer enzyme that breaks down ACh, terminating
signal
4) sarcolemma (Sara) - Answer cells that contain motor end plate (Mom) & create electrical
signal in muscle
5) t-tubules (To) - Answer invagination of sarcolemma causing deeper penetration of AP
signal
6) sarcoplasmic reticulum (Sing) - Answer specialized ER that stores and releases Ca in
response to depolarization
7) troponin / tropomyosin (To) - Answer proteins that control actin & myosin during muscle
contraction
8) myosin / actin (Mother) - Answer proteins that interact with each other for muscle
contraction
9) motor unit (Mary) - Answer
how does the NMJ function? - Answer acts as an integrator such that it receives a signal from
a motor neuron, that causes an A.P., causing Ach release and binding to receptors, which results
in muscle contraction
Solved Correctly 2026.
what is the neuromuscular junction? - Answer synapse between a motor neuron and a
muscle fiber
list and define the key components of the PRE-synaptic NMJ: (Mom Said Axl Volunteered Apple
Seeds) - Answer 1) motor neuron terminal - end of neuron neurotransmitter-filled synaptic
vesicles
2) synaptic vesicles - Ach storage
3) axon terminal - end of neuron close to muscle fiber
4) voltage gated Ca2+ channels - allow Ca into neuron upon A.P.
5) action potential - signal that triggers neurotransmitter release
6) synaptic cleft - space between neuron terminal and muscle fiber membrane
1) motor neuron terminal - Answer end of neuron that contains synaptic vesicles filled with
ACh neurotransmitters
2) synaptic vesicles - Answer ACh storage
3) axon terminal - Answer end of axon that is close to muscle fiber
4) voltage gated calcium channels - Answer open upon AP, resulting in calcium influx (into the
cell)
calcium is more concentrated on the ______ of the cell - Answer outside
5) action potential - Answer a strong and quick electrical charge that travels down an axon
6) synaptic cleft - Answer space between axon and cell
list and define the key components of the POST-synaptic NMJ: (Mom Asked Ally & Sara To Sing
To Mother Mary) - Answer 1) motor end plate - special region of muscle fiber membrane rich
w ach receptors
2) ach receptors - proteins in motor end plate that bind to ach, resulting in depolarization of
muscle fiber membrane
3) acetylcholinesterase (AChE) - enzyme that breaks down Ach, terminating A.P.
, 4) sarcolemma - muscle cell that contain motor end plate & creates muscle fiber electrical signal
5) t-tubules - folding back of sarcolemma that enhances A.P. deep into fiber
6) sarcoplasmic reticulum - specialized E.R that stores and releases Ca in response to
depolarization (A.P.)
7) troponin/tropomyosin - regulatory proteins that control myosin/actin binding during muscle
contraction
8) myosin/actin filaments - proteins in muscle fibers that interact to contract muscle
9) motor unit - single motor neuron & all muscle fibers it innervates
1) motor end plate (Mom) - Answer specialized region of muscle fiber lined with ACh
receptors
2) acetylcholine receptors (Asked) - Answer proteins binding to ACh, resulting in
depolarization of muscle membrane
3) acetylcholinesterase (AChE) (Ally) - Answer enzyme that breaks down ACh, terminating
signal
4) sarcolemma (Sara) - Answer cells that contain motor end plate (Mom) & create electrical
signal in muscle
5) t-tubules (To) - Answer invagination of sarcolemma causing deeper penetration of AP
signal
6) sarcoplasmic reticulum (Sing) - Answer specialized ER that stores and releases Ca in
response to depolarization
7) troponin / tropomyosin (To) - Answer proteins that control actin & myosin during muscle
contraction
8) myosin / actin (Mother) - Answer proteins that interact with each other for muscle
contraction
9) motor unit (Mary) - Answer
how does the NMJ function? - Answer acts as an integrator such that it receives a signal from
a motor neuron, that causes an A.P., causing Ach release and binding to receptors, which results
in muscle contraction
