Muscles are widely distributed in the human body, which shows that human muscles are the main body of the body. Generally speaking, their names are named according to the type, shape, position and function of muscles.
There are about 639 human muscles. It consists of about 6 billion muscle fibers, the longest is 60 cm, the shortest is only about 1 mm, the big muscle weighs about two kilograms, and the small muscle weighs only a few grams.
Extended data:
Muscle action
Muscle contraction pulls bones to produce joint movement, which acts like a lever device. There are three basic forms:
1, the balance bar moves, and the fulcrum is between the key point and the force point, such as the up-and-down movement of the atlanto-occipital joint.
2, labor-saving lever action, its focus is between the fulcrum and the stress point, such as the ankle action when starting to lift the heel.
3. Speed bar movement, the stress point is located between the key and the fulcrum, such as the movement of the elbow joint when lifting heavy objects.
References:
Baidu encyclopedia-muscle
References:
Baidu encyclopedia-muscle group