PHYSIOLOGY
MUSCLE CONTRACTION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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What is the correct sequence of events for muscle contraction?
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The neuron synapses with a muscle cell exposing the myosin binding site, then calcium binds to myosin which binds to actin and pulls it towards the sarcomere which causes muscle contraction.
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Calcium binds to troponin which exposes the myosin binding site, a signal is then sent down a neuron, the neuron synapses with muscle cells (communication), myosin head binds to actin and pulls it towards the sarcomere which causes a muscle contraction.
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Signal is sent down a neuron, the neuron synapses with muscle cells (communication), calcium binds to troponin which exposes the myosin binding site, myosin head binds to actin and pulls it towards the sarcomere which causes muscle contraction.
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None of the above
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Explanation:
Detailed explanation-1: -Action potential travels down motor neuron. Acetylcholine (ACH) released into sarcolemma. Action potential on sarcolemma. Sodium ions (Na+) rush into muscle cell. Calcium (Ca+) released from cisternae. Myosin heads attach to actin. Muscle contracts.
Detailed explanation-2: -A nerve impulse travels to the neuromuscular junction on a. Ach is released from the axon to receptors located on the. The binding Ach causes depolarization of the sarcolemma by. Na+ ions diffuse into the muscle fiber and depolarization. More items
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