question archive Which of the choices is true regarding muscle contraction? A nerve impulse (action potential) is required to have sodium and potassium released into the synaptic cleft T-tubules help transmit the action potential deep into muscle cell to stimulate the release of calcium from the endoplasmic reticulum ATP is needed for the power stroke to occur The myosin head binds to the troponin and tropomyosin proteins of the thin filament
Which of the choices is true regarding muscle contraction? A nerve impulse (action potential) is required to have sodium and potassium released into the synaptic cleft T-tubules help transmit the action potential deep into muscle cell to stimulate the release of calcium from the endoplasmic reticulum ATP is needed for the power stroke to occur The myosin head binds to the troponin and tropomyosin proteins of the thin filament
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Which of the choices is true regarding muscle contraction?
A nerve impulse (action potential) is required to have sodium and potassium released into the synaptic cleft
T-tubules help transmit the action potential deep into muscle cell to stimulate the release of calcium from the endoplasmic reticulum
ATP is needed for the power stroke to occur
The myosin head binds to the troponin and tropomyosin proteins of the thin filament
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Answer:
T - tubules help transmit the action potential deep into the muscle cell to stimulate the release of calcium ions from the endoplasmic reticulum
T- tubules are transverse tubules formed by inward extension of sarcolemma. They are the connection for the action potential to reach deeper into the muscle cells which furthur trigger the release of calcium ions from sarcoplasmic reticulum. Without T- tubules there would be no muscle contraction possible. Myosin binds to the actin to form cross bridge, Pi dosoociates and then there is power stroke. It reaches lower energy stage and sarcomere shortens.
