Part C - How an action potential affects Ca2 + movement in a muscle cell The sarcoplasmic reticulum is a specialized form of ER that surrounds each myofibril. The sarcoplasmic reticulum functions to control cytosolic Ca2 + levels in the muscle cell. Changes in cytosolic Ca2 + concentrations couple action potentials to muscle contraction. The concentration of Ca2 + ions in the sarcoplasmic reticulum is typically much higher than the Ca2 + concentration in the cytosol. This concentration gradient is key to the movement of Ca2 + in the muscle cell in response to an action potential. The cycle diagram below shows the sequence of events that affect Ca2 + levels in a muscle cell, beginning with the propagation of an action potential down a T tubule (top of the diagram). Drag the labels to their appropriate locations on the cycle diagram below. Note that SR stands for sarcoplasmic reticulum.

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Biology

Bubblegum

28 November, 04:47

Part C - How an action potential affects Ca2 + movement in a muscle cell The sarcoplasmic reticulum is a specialized form of ER that surrounds each myofibril. The sarcoplasmic reticulum functions to control cytosolic Ca2 + levels in the muscle cell. Changes in cytosolic Ca2 + concentrations couple action potentials to muscle contraction. The concentration of Ca2 + ions in the sarcoplasmic reticulum is typically much higher than the Ca2 + concentration in the cytosol. This concentration gradient is key to the movement of Ca2 + in the muscle cell in response to an action potential. The cycle diagram below shows the sequence of events that affect Ca2 + levels in a muscle cell, beginning with the propagation of an action potential down a T tubule (top of the diagram). Drag the labels to their appropriate locations on the cycle diagram below. Note that SR stands for sarcoplasmic reticulum.

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Quintin · Answer 1

It starts in action potential propagates down to T tubule. It goes to part a where Ca2+channels in SR open. Part b where Ca2 + diffuses out of SR. Part c where cytosolic Ca2 + level rises to part d where Ca2 + diffuses into myofibrils the action potential is completed and goes on to part e where Ca2 + channels in SR dose to part f where Ca2 + level drops to part h where Ca2 + diffuses out of myofibril then back to action potential propagates down T tubules.