Which of the following statements correctly descended(s) T tubules and their rol

Question

Which of the following statements correctly descended(s) T tubules and their role in conducting action potentials in muscle cells? Select all that apply. T tubules are inholdings of the plasma membrane that encircle the myofibrils and are in contact with the sarcoplasmic reticulum. Without T tubules, the muscle cell would not be able to contract. T tubules lack the voltage-gated Na^+ and K^+ channels that are present in the plasma membrane. T tubules carry action potentials into the interior of the muscle cell via voltage-gated Na^+ and K^+ channels. T tubules are extensions of the sarcoplasmic reticulum that are in contact with the plasma membrane. T tubules have receptor proteins that bind neurotransmitters released from the synaptic terminal of the motor neuron. The sarcoplasmic reticulum is a specialized from of ER that surrounds each myofibril. The sarcoplasmic reticula functions to control cytosolic action potentials to muscle contraction. The concentration of Ca^2+ ions in the sarcoplasmic reticulum is typically much higher than the Ca^2+ concentration in the cytosol. This concentrate an action potential. The cycle diagram below shows the sequence of events that affect Ca^2+ levels in a muscle cost., beginning with the propagation of an action potential

Explanation / Answer

T -tubules :

The correct answers are :

Reason:T tubules are the infoldings of the sarcolemma of the skeletal and cardiac muscle cells.They are not required for contraction of smooth muscle cells.The tubules transfer the action potential via voltage gated Na+ and K+ present in the sarcolemma into the sarcoplasmic reticulum thatbin turn releases Ca+ into the cytosol.

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