Voltage gated sodium channels in the membranes of motor neurons open when:

The sodium/potassium pump forces more sodium ions inside neurons to make the resting membrane potential more negative.

What is happening during phase 3 on this action potential diagram?

Which brain structure plays a major role in sleep-wake cycles by secreting melatonin?

Which direction do action potentials travel along the corticospinal tract?

Which of these structures contains cell bodies of unipolar, sensory neurons?

Within the peripheral nervous system, the myelin sheath is formed by:

The whole nervous system is divided into two main divisions, called the:

The structural type of neuron that has many dendrites and one long axon is:

Which of these is not associated with the sympathetic branch of the ANS?