WorksheetsEvents at the Neuromuscular Junction
Total questions: 15
Worksheet time: 8mins
What separates the neuron and the muscle?
ACh receptor
Synaptic cleft
Calcium channel
Synaptic vesicle
The axon terminal is at the end of the neuron and it is filled with _________ _______ containing ACh (acetylcholine)
ACh receptors
Synaptic vesicles
Neuromuscular junction
Synaptic cleft
An arriving _______ __________ depolarizes the synaptic knob.
action potential
calcium channels
synaptic cleft
enzyme acetylcholinesterase
The ACh binds to receptors in the ___________
sarcomere
axon terminal
sarcolemma
synaptic cleft
What parts can be described a "a match made in heaven"?
Synaptic cleft
ACh receptors
Synaptic vesicles
Neuromuscular junction
What is the final step of the Neuromuscular Junction?
Calcium Channels open and enter the axon terminal
ACh binds to receptors in the sarcolemma
The ACh binding, allows the sarcolemma to take in sodium and release potassium our of the muscle cell (depolarization occurs when more sodium enter than potassium ions enter
The effects of the Ach is terminated by the enzyme acetylcholinesterase
Calcium entry triggers the synaptic clefts to open and ACh to enter the ________ ______
action potential
calcium channels
synaptic cleft
enzyme acetylcholinesterase
What is acetylcholine?
The chief neurotransmitter of the parasympathetic nervous system
The axon terminal at the end of the neuron
The muscle fiber’s sarcolemma at the synaptic cleft
The muscle and the neuron
One neuron and all the skeletal muscle cells it stimulates is the ____ ___.
Neurotransmitter
Neuromuscular junction
Motor unit
Synaptic cleft
Once sodium is pumped into the sarcolemma, what happens?
Action potential is transferred to the sarcolemma to cause contraction.
The process ends and ACh breaks down.
Calcium is pumped into the axon terminal.
ACh is released into the synaptic cleft.
Contractile unit of a muscle which is also the functional unit of a muscle is ...
sarcomere
motor unit
fascicle
myofibril
What enzyme breaks down acetylcholine into acetic acid and choline to prevent continued contraction of the muscle fiber?
potassium ions
calcium ions
cross bridges
acetylcholinesterase
Neurotransmitters are released upon stimulation from a nerve impulse from the ________.
axon terminals of the motor neuron
myofibrils
sarcolemma of the muscle cell
sarcoplasmic reticulum
Which of these events must occur first to trigger the skeletal muscle to generate an action potential and contract?
Potassium ions diffuse out of the muscle cell.
Acetylcholine (ACh) binds to receptors on the sarcolemma and allows passage of sodium ions into the cell.
The sodium-potassium pump restores sodium and potassium back to their initial positions.
Acetylcholinesterase (AchE) breaks down acetylcholine (ACh).
The point at which the nerve cell reaches the sarcolemma of the muscle fiber is the _____.
Neurotransmitter
Acetylcholine
Synaptic cleft
Neuromuscular Junction
