CVS Practice Test

Skeletal muscle is considered voluntary because it is under conscious control, allowing individuals to move these muscles intentionally when needed. This control is facilitated through the somatic nervous system, enabling actions such as walking, lifting, and other physical activities. Each skeletal muscle fiber is innervated by motor neurons, which help coordinate movements.

In contrast, cardiac muscle, which makes up the heart, operates involuntarily. It contracts automatically without conscious thought or control, ensuring that the heart can pump blood continuously. Similarly, smooth muscle, found in various organs like the intestines and blood vessels, also functions without conscious control and is responsible for involuntary actions such as peristalsis and regulating blood flow.

Therefore, the distinction lies in the control over the muscle types, making skeletal muscle the only one among the options that is categorized as voluntary.