Kaplan Nursing Entrance Practice Exam 2026 – The All-in-One Guide to Exam Success!

Involuntary muscle refers to types of muscle tissues that are not under conscious control, meaning they function automatically without the need for intentional thought or decision-making by the individual.

Cardiac muscle is found exclusively in the heart and contracts involuntarily to pump blood throughout the body. Its rhythmic contractions are essential for maintaining circulation and are regulated by the heart's pacemaker cells.

Smooth muscle is also involuntary, and it is located in walls of hollow organs such as the intestines, bladder, and blood vessels. This type of muscle contracts to facilitate various bodily functions, including digestion and blood flow, without conscious effort.

Skeletal muscle, on the other hand, is primarily voluntary, as it is controlled consciously to facilitate movement, although there are some reflexive actions where skeletal muscles are involved involuntarily.

By recognizing that both cardiac and smooth muscles are involuntary while skeletal muscle is predominantly voluntary, it becomes clear that the appropriate answer affirmatively acknowledges that cardiac and smooth muscle types display this involuntary characteristic. Thus, the correct choice highlights the involuntary nature of both cardiac and smooth muscle types.