Sensory nerves regulate muscle contraction.

___________describes the fact that at rest, all cells have a negative internal charge and an unequal distribution of ions.

Membrane potential is established, in part, by a difference in ion concentration gradients across the membrane.

Membrane potential is defined as_____.

The primary intracellular cation is________.

Acetylcholine __________________. (Select all that apply.)

Select the correct order:

Action potentials frequency encodes stimulus intensity.

During skeletal muscle contraction______.

Chemical synapses____________.