Skeletal muscle, cardiac muscle, smooth muscle similarities and differences, skeletal muscle is thick, cardiac muscle is short and fat, smooth muscle is thin and long, the distribution of different locations and shapes.
1. Skeletal muscle: muscle cells have transverse lines, composed of thick and thin myofilaments, also known as transverse muscle, mainly distributed in the limbs, trunk, head and neck, belongs to the random muscle, pink stripes, mainly able to help the body to move the power organs.
2. Smooth muscle: not controlled by human consciousness, can be observed under the light microscope in the shape of a shuttle, elongated, the nucleus is located in the center of the cell, and its distribution is mainly in the digestive tract or other internal organs, mainly to help the digestive tract peristalsis.
3. Myocardium: myocardium is short and fat, is also a unique muscle tissue of the heart, belongs to the involuntary muscle, the heart will not change with the will of the heart, myocardial fibers are irregular short columnar, there are a few double nuclei, the shape of the ovoid, mainly located in the center of the cell.
Similarities: ① are composed of muscle cells; ② have the function of contraction and diastole; ③ they can cause the movement of the body and various organs when they contract.