Starting with the arrival of an action potential at the neuromuscular junction, which of the following is the correct order of events?
A) Calcium is released from the sarcoplasmic reticulum, an action potential travels down the T tubules, depolarization spreads through the T tubule, and myosin binds actin.
B) An action potential travels down the T tubules, depolarization spreads through the T tubule, calcium is released from the sarcoplasmic reticulum, and myosin binds actin.
C) An action potential travels down the T tubules, depolarization spreads through the T tubule, calcium is taken up by the sarcoplasmic reticulum, and myosin binds actin.
D) An action potential travels down the T tubules, depolarization spreads through the T tubule, ATP binds to myosin, and myosin binds actin.
E) A T tubule is depolarized, calcium is released from the sarcoplasmic reticulum, an action potential is created in the muscle cell, and myosin binds actin.

Question

Quizplus · Accepted Answer

The correct order of events starting with the arrival of an action potential at the neuromuscular junction is as follows: 1) An action potential travels down the T tubules, 2) depolarization spreads through the T tubule, 3) calcium is released from the sarcoplasmic reticulum, and 4) myosin binds actin. This sequence of events results in muscle contraction. Choice B accurately describes this sequence.

Starting with the Arrival of an Action Potential at the Neuromuscular