What type of muscle can be classified as involuntary?

Involuntary muscle refers to muscle that operates without conscious control. Smooth muscle is found in the walls of hollow organs such as the intestines and blood vessels, and it performs functions like moving food through the digestive tract and regulating blood flow. Cardiac muscle, found only in the heart, is also involuntary and responsible for pumping blood throughout the body. Both types of muscle are controlled by the autonomic nervous system, which regulates bodily functions that occur without conscious effort. This means that both smooth and cardiac muscles function automatically to respond to physiological signals.

Skeletal muscle, on the other hand, is under voluntary control and is involved in movements that we consciously regulate, such as walking or picking up objects. This distinction is crucial in understanding how different types of muscle tissue operate within the body. Thus, the correct answer encompasses both smooth and cardiac muscle as involuntary types, reflecting their automatic functioning.