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WorksheetsNeuromuscular Junction
Total questions: 24
Worksheet time: 11mins
The gap between the nerve cell and sarcolemma is the ____ ___.
Synaptic cleft
Neurotransmitter
Motor unit
Neuromuscular junction
What is the specific neurotransmitter that stimulates the movement of skeletal muscles?
GABA
Acetylcholine
Serotonin
Dopamine
Once the action potential reaches the end of the pre-synaptic terminal what takes place?
ACh is released into the synaptic cleft.
Calcium is pumped into the sarcolemma.
Calcium is pumped into the presynaptic terminal.
The muscle contracts.
Once calcium is pumped into the presynaptic terminal what happens?
The muscle contracts
ACh is released into the synaptic cleft.
Sodium pumps into the sarcolemma.
The muscle contracts.
What is the name of the component that houses the neurotransmitters?
Synaptic cleft
Acetylcholine
Receptors
Synaptic vesicles
When at rest, calcium and sodium ion channels
are closed and prevent the ion from entering the cells.
are open and allow the ions to flow into the cells
are closed and keep the ions trapped inside the cells
are opening and closing a regular intervals
What causes the sodium channels on the muscle to open?
Acetylcholine binds to the Na+ channel
Acetylcholine binds to the synaptic vesicles
the Ca2+ channels open
The action potential is generated in the muscle cell
What is the role of acetylcholinesterase? (two answers)
It allows acetylcholine to leave the synaptic cleft
It creates acetylcholine out of acetic acid and choline
It breaks acetylcholine down into choline and acetic acid
It helps acetylcholine re-enter the neuron
What happens at the neuromuscular junction?
A sensory neuron communicates with a motor neuron
An action potential jumps from the muscle to the neuron
A nerve signal traveling down a motor neuron can jump over to the muscle cell
Muscle cells contract in response to a sensory neuron
Which ion is primarily responsible for initiating the release of neurotransmitters at the synaptic terminal?
Potassium
Calcium
Sodium
Chloride
What is the role of acetylcholinesterase in the neuromuscular junction?
It breaks down acetylcholine in the synaptic cleft
It transports calcium ions into the muscle cell
It stimulates the release of acetylcholine
It opens sodium channels on the muscle cell
What is acetylcholine?
an ion pump on the postsynaptic membrane
a source of energy for muscle contraction
a component of thick myofilaments
a neurotransmitter that stimulates skeletal muscle to contract
What is number 6 pointing to?
a muscle cell
a synaptic vesicle
a neurotransmitter
a neuron
What is the function of this entire diagram?
controlling a nerve
controlling a skeletal muscle contraction
endocytosis
inserting a musle on a bone
The cell membrane of a skeletal muscle fiber is called the:
sarcomere
myofilament
sarcolemma
sarcoplasm
Skeletal Muscle contraction is initiated when the ________ sends a message/signal to the muscle cell.
Muscle cell
Motor Neuron
Gland
None of the above
Identify structure 4 in the diagram.
synaptic cleft
sarcolemma
vesicle
Ca2+ ion
Identify structure 3 in the diagram.
synaptic cleft
motor end plate
axon terminal
ACh
Identify structure 2 in the diagram.
synaptic cleft
motor end plate
axon terminal
ACh
Identify structure 1 in the diagram.
synaptic cleft
motor end plate
axon terminal of motor neuron
ACh
Which type of signaling mechanism is electrical and is produced inside of cells?
Sensory Signal
Neurotransmitter
ACh
Action Potential
