The nervous system physiology experiments involved measurement of muscle activity with electrodes at the skin that result from physiological processes at the neuromuscular junction. At which stage of the myogram (graph that shows muscle twitch) does calcium return to the sarcoplasmic reticulum?Question 9Answera.Latencyb.Contractionc.Relaxationd.Depolarisation

An elaborate network of membranes in skeletal muscle fibers that functions as calcium storage is Group of answer choicessarcolemmamyofibrilssarcoplasmsarcoplasmic reticulum

Which substance is stored in the muscle’s endoplasmic reticulum and then released when a nerve signal stimulates a muscle fiber?Group of answer choicesMyoglobinCalcium ionsATPSarcomeres

The energy source for muscle contractions is…*1 pointAdenosine triphosphate (ATP)calciumcholinesteraseglucose

Which of the following events in muscle contraction is the last to occur chronologically? The T-tubules depolarize, causing calcium to be released from the sarcoplasmic reticulum. Calcium is taken up into the sarcoplasmic reticulum. Tropomyosin moves, exposing the actin active sites. ATP binds to the myosin head allowing it to release from actin.

Which statement most accurately describes the role of T tubules in skeletal muscle cells?A.T tubules bind acetylcholine at the neuromuscular junction to generate a depolarizing stimulus.B.Depolarizing current reaches the sarcoplasmic reticulum by traveling down T tubules.C.Muscle contraction is driven by the sliding of T tubules across one another in the sarcomere.D.T tubules sequester Ca2+ out of the cytosol to prevent prolonged muscle contraction.