Smooth muscle – also called involuntary muscle, is a muscle that shows no cross stripes under microscopic magnification. It consists of narrow spindle-shaped cells with a single, centrally located nucleus. Smooth muscle tissue contracts slowly and automatically. It constitutes much of the musculature of internal organs and the digestive system.

Cardiac muscle tissue – or myocardium, is a specialized, organized type of tissue that only exists in the heart. It is responsible for keeping the heart pumping and blood circulating around the body. These cells expand and contract in response to electrical impulses from the nervous system. These cardiac cells work together to produce the rhythmic, wave-like contractions that is the heartbeat.

Skeletal muscle tissue – Make up between 30 to 40% of your total body mass. They’re located between bones and serve a variety of functions, including:
• Chewing and swallowing
• Expanding and contracting your chest cavity
• Maintaining body posture.
• Moving the bones in different parts of your body.
• Protecting joints and holding them in place.