An action potential occurs in an axon that synapses at a muscle; this specific type of synapse is called a neuromuscular junction. During the action potential, the membrane potential of the axon sharply depolarizes as the signal moves towards the terminal. Upon reaching the synaptic terminal, neurotransmitters are released and interact with receptors on the muscle. Which of the following best summarizes the changes that occur in the post-synaptic muscle after a neurotransmission event?

What protein is responsible for maintaining the resting potential across a neuronal plasma membrane?

Which of the following choices corresponds to what is happening in a cell when an action potential reaches its peak?

Which phase of the action potential begins when there is a rapid and massive influx of sodium ions into the neuron?