Which of the following is NOT a type of muscle?

The correct answer is that circulatory is not a type of muscle. In the context of human anatomy, muscles are classified into three main categories based on their structure and function: striated (skeletal), smooth, and cardiac muscle.

Striated muscle, also known as skeletal muscle, is under voluntary control, meaning it is used for movements that we consciously control, like walking or lifting objects.

Smooth muscle, on the other hand, operates involuntarily and is found in various systems of the body, such as the digestive and respiratory tracts. It regulates functions such as movement in the intestines and the diameter of blood vessels.

Cardiac muscle is specialized muscle found only in the heart. It is also involuntary and has its unique structure and control mechanisms, allowing the heart to pump blood effectively.

Circulatory refers to the cardiovascular system as a whole, which includes the heart, blood vessels, and blood, but it is not classified as a type of muscle itself. This distinction highlights the specific roles and classifications within the muscular and circulatory systems. Understanding these differences is essential for comprehending how the body functions overall.