Select all following statements that correctly describe T tubules and their role

Question

Select all following statements that correctly describe T tubules and their role in conducting action potentials in muscle cells. T tubules are infoldings of the plasma membrane that encircle the myofibrils and are in contact with the sarcoplasmic reticulum. T tubules have receptor proteins that bind neurotransmitters released from the synaptic terminal of the motor neuron. T tubules lack the voltage-gated Na^+ and K^+ channels that are present in the plasma membrane Without T tubules, the muscle cell would not be able to contract. T tubules are extensions of the sarcoplasmic reticulum that are in contact with the plasma membrane. T tubules carry action potentials into the interior of the muscle cell via voltage-gated Na^+ and K^+ channels.

Explanation / Answer

T tubules are infoldings of the plasma membrane that encircle the myofibrils and are in contact with the sacroplasmic reticulum.
Without T tubules, the muscle cell would not be able to contract.
T tubules carry action potentials into the interior of the muscle cell via voltage-gated Na+ and K+ channels.

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