Last issue we learned about the components of our body. So we have already known that the human body can be divided into 10 parts from appearance, meanwhile, many organs can compose 9 systems respectively.

On this issue, we would like to talk about the first system of our body, motor system.

To be specific, the motor system consists of bone, bone attachment and skeletal muscle, which accounts for about 50 to 70 percent of an adult's body weight. And the motor system performs support, protection and motor functions. The small bones of the entire body are connected in different forms to form regional skeletons, support bodies, protect internal organs, maintain body posture, give the basic structures of the body, and provide broad attachment points for skeletal muscles. The bone is also an important hematopoietic organ. In the meantime, the bones are able to store calcium, phosphorus and other minerals in the body. Skeletal muscle is the power device of the motor system. Under the control of the nervous system, skeletal muscle pulls the attached bone across one or more joints, and uses the bone attachments as the hub to generate lever movement. Bones and bone attachments are passive parts of the motor system, and skeletal muscles are active parts of the motor system.

According to current study about bones, there are 206 bones in the adult body. Children, on the other hand, have more bones than adults, because their sacrum has five bones, which grow into one. Coccyx of a child has 4-5 pieces, which also become one piece when growing up. The child has two ilium bones, two ischium bones, and two pubic bones. But for adults, they have two hipbones. As a result, children have 11-12 more bones than adults, which is 217-218.

Bone, bone attachment and skeletal muscle make up our motor system, which is crucial to achieve movement for bones acting as a framework to support our body under the influence of gravity.

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