In addition to responding to neurotransmitters, muscle fibers in visceral smooth muscle stimulate each other to contract, causing them to contract and relax together and producing an action called ________.

Neurotransmitters

Chemical compounds responsible for sending signals from one neuron to another across synapses in the nervous system.

Visceral Smooth Muscle

The type of smooth muscle found in the walls of internal organs such as the stomach, intestines, and blood vessels, not under conscious control.