Neuromuscular Junction and muscle contraction

the transmitter substance in the neuromuscular junction

• Noradrenaline

• Acetylcholine

• Dopamine

• GABA

Once the action potential reaches the end of the axon terminal what takes place?

• ACh is released into the synaptic cleft.

• Calcium is pumped into the sarcolemma.

• Calcium is pumped into the AT.

• The muscle contracts.

Once calcium is pumped into the axon 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

Once ACh binds to receptor cells on the sarcolemma, what takes place?

• Sarcolemma becomes temporarily permeable to sodium.

• The muscle contracts.

• Calcium is pumped into the axon terminal.

• Synaptic vesicles move to the end of the terminal.

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.

Which of the following occur when ATP binds to the myosin head?

• Myosin head change to low energy configuration

• Myosin head undergoes power stroke

• Myosin head detach from actin

• Myosin head forms cross bridge

Which of the following decreases during muscle contraction? (Multiple [2] answer)

• I band

• A band

• Z line

• H zone

• M line

Ca2+ will be released from the sarcoplasmic reticulum when

• impulse reaches neuromuscular junction

• impulse transmitted along T tubule

• ATP binds to sarcoplasmic reticulum

• acetyl choline binds to ligand gated ion channels

Ca2+ released by sarcoplasmic reticulum will bind to

• Actin

• Troponin

• Myosin

• Tropomyosin