What encompasses both heart muscle and smooth muscle types?

The correct answer is that involuntary muscle encompasses both heart muscle and smooth muscle types. Involuntary muscles are those that function without conscious control. Cardiac muscle, which makes up the heart, is responsible for pumping blood and operates automatically, while smooth muscle is found in various internal structures such as blood vessels and the digestive tract, and it manages functions like movement in these systems without needing conscious input.

In contrast, skeletal muscle is a voluntary muscle type, meaning it operates with conscious control over movement, such as when you move your arms or legs. This distinction excludes it from the scope of the question. Additionally, striated muscle refers specifically to a type of muscle that has a banded appearance and includes skeletal and cardiac muscle; however, it does not encompass smooth muscle, which is non-striated. Voluntary muscle, similarly, refers only to muscle types that can be controlled consciously, eliminating smooth muscle from consideration. Thus, involuntary muscle is the correct term as it accurately includes both the cardiac and smooth muscle types.