Answer:
b. involuntary
Step-by-step explanation:
Cardiac and smooth muscle are both types of muscle tissue that are found in different parts of the body. Cardiac muscle is found in the heart and is responsible for pumping blood throughout the body. Smooth muscle is found in the walls of hollow organs, such as the stomach, intestines, bladder, and blood vessels, and is responsible for moving substances through them. Both cardiac and smooth muscle are involuntary, which means that they contract and relax without conscious control. They are controlled by the autonomic nervous system, which regulates the body’s internal functions. In contrast, skeletal muscle, which is attached to bones and enables movement, is voluntary, which means that it can be controlled consciously by the somatic nervous system.