The human body has 600 muscles. Muscles do everything from pumping blood to lifting large weights or giving birth. Muscles contract or relax to motion. This movement may be voluntary (meaning made consciously) or unconscious (involuntary).

Muscles are classified as follows:

Skeletal muscle — connective tissue that provides movement. The musculoskeletal system includes muscles and bones (also known as the locomotor system). The biceps and triceps on either side of the upper arm are examples of opposing skeletal muscle pairs. Voluntary muscles are skeletal muscles that are controlled by our conscious mind. Microscope images of the muscle tissue seem striped or striated.

Smooth muscle is found in the digestive tract, uterus, and blood vessels such as arteries. Smooth muscle is layered and contracts in waves along its length. Smooth muscle motion occurs without our conscious awareness, hence the phrase involuntary muscle.

Cardiac muscle: the heart’s own muscle. The heart contracts and relaxes automatically.

Reference
Muscles. (n.d.). Better Health Channel – Better Health Channel. https://www.betterhealth.vic.gov.au/health/conditionsandtreatments/muscles

Muscle tissue is made up of cells that can shorten or contract to move the bodily components. The tissue is very cellular and blood vessel-rich. Muscle fibers are long, slender cells organized in bundles or layers surrounded by connective tissue. Muscle actin and myosin are contractile proteins.

Muscle tissue is divided into three types: skeletal, smooth, and cardiac.Sm

Smooth Muscle. The autonomic nervous system controls the muscle present in hollow internal organs such blood vessels, gastrointestinal tract, bladder, and uterus. Smooth muscle is uncontrollable and hence unconsciously acts. The nonstriated (smooth) muscle cell has a single nucleus. Smooth muscle contracts slowly.

Cardiac Muscle.  The autonomic nervous system controls the heart’s wall muscle. Like smooth muscle, cardiac muscle is striated like skeletal muscle. The heart muscle cell is square. Cardiac muscle contractions are automatic, powerful, and rhythmic.

Skeletal Muscle. This muscle attaches to bone and controls skeletal motions. The peripheral CNS controls the skeletal muscles. These muscles are voluntarily controlled. The basic unit is the nucleated muscle fiber. These striated muscle fibers function independently of one another. Skeletal muscle functions include movement, heat production, and posture. Muscle tissue has five functional characteristics:
1. Irritability-responsiveness to stimuli.
2. Conductivity-transmitting impulses.
3. Extensibility-stretchability
4. Elasticity-recovery of original length after stretching.
5. Shortening ability

References
National Cancer Institute. (n.d.). Muscle Tissue. https://training.seer.cancer.gov/anatomy/cells_tissues_membranes/tissues/muscle.html#:~:text=Muscle%20tissue%20is%20composed%20of,well%20supplied%20with%20blood%20vessels