Which of the following muscle types has tone in the absence of an external stimulus?

Question

Quizplus · Accepted Answer

Single-unit smooth muscle, also known as visceral smooth muscle, exhibits tone in the absence of external stimuli due to its ability to generate spontaneous electrical activity within the muscle itself. This is in contrast to skeletal and multiunit smooth muscle, which generally require an external stimulus to contract, and cardiac muscle, which has intrinsic rhythmicity but is not typically described in terms of tone without external stimulus.

Which of the Following Muscle Types Has Tone in the Absence