The muscles make up almost half of the body's total weight. They require a lot of energy and oxygen in order to function. Carbohydrates are the energy source that fuels muscle contraction. Muscle growth, on the other hand, requires a lot of protein.

There are three types of muscle tissue in the human body.

Cardiac muscle is involuntary, striated muscle that is found in the heart. When contracted, muscle cells produce a contraction of the heart, whereby blood is transported along the blood vessels away from the heart.

As you run, the voluntary, striated skeletal muscles contract.

Smooth muscle cells contract involuntarily. They are used to move food in the gut and blood in the veins.

Human muscles differ from an individual to another. One person may be good at exercise that requires endurance, while another person is really quick in short distance races. Speed ​​requires strength, so fast people have stronger muscles in their legs.