MUSCLE NERVE CARTILAGE BONE
SKELETAL MUSCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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the action potential reaches the neuromuscular junction
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ATP binds to sarcoplasmic reticulum
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Acetylcholine enters the synaptic cleft
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Action potential travels along T tubules
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Detailed explanation-1: -The depolarization then spreads along the sarcolemma and down the T tubules, creating an action potential. The action potential triggers the sarcoplasmic reticulum to release of Ca2+, which activate troponin and stimulate muscle contraction.
Detailed explanation-2: -Answer and Explanation: Calcium is released from the sarcoplasmic reticulum as an action potential passes through the T tubules.
Detailed explanation-3: -When the muscle is stimulated, calcium ions are released from its store inside the sarcoplasmic reticulum, into the sarcoplasm (muscle ). Invaginations of the plasma membrane (sarcolemma) of the muscle fibres are called T (or transverse) tubules.
Detailed explanation-4: -Depolarization of the sarcolemma (muscle membrane) caused by nerve stimulation causes calcium ions to be released from the sarcoplasmic reticulum.
Detailed explanation-5: -The action potential invades T-tubules and causes the L-type calcium channels to open, which in turn causes ryanodine receptors (RyRs) in the SR to open and release calcium, which stimulates contraction.