The muscles of the human body are divided into three types: smooth muscle, myocardial and skeletal muscle, and can be classified into long muscle, short muscle, latissimus and orbicularis muscle. Smooth muscle is mainly composed of internal organs and blood vessels, which have the characteristics of slow contraction, long duration and not easy to fatigue. The myocardium is composed of the heart wall, which does not shrink with the human will, so it is called involuntary muscle. Skeletal muscle is distributed in the head, neck, trunk and limbs, usually attached to the bones, and the skeletal muscles contract rapidly, effectively and easily, and can be reduced with the will of the person. Skeletal muscle is observed in transverse striatum under microscope, so it is also known as rhabdomyotic muscle.
Foods containing protein include meat, poultry and fish, dairy products, eggs, wheat, rye, corn, oats, barley, millet, edible mushrooms, beans and nuts, etc.
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There are various kinds of foods available in nature for human consumption. But maintain daily species only need nutrients: protein, carbohydrates, fats, minerals (also called inorganic salt, can be divided into two categories, major elements and trace elements), vitamins, dietary fibre and water 7 categories, a total of more than 40. Each has its own special physiological function and participates in the metabolism of human body. Any kind of natural food in nature cannot provide all the nutrients the human body needs, and it must be matched in proportion to each other to meet the reasonable nutritional needs of the human body. Therefore, reasonable nutrition emphasizes that the nutrients in human consumption should be complete, moderate and proportionate.