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.

Question

Cohen Mccullough

Biology

12 March, 15:11

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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Kylie Underwood · 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.