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人体的骨头,大小約有206塊。其中最大的为大腿骨(股骨),最小的是耳內的三对听骨。骨头根据功能的不同,又有各种形状和名称。例如长形的叫长骨,上肢的肱骨、尺骨和橈骨,下肢的股骨、胫骨和腓骨,都是长骨。有的骨很短叫做短骨,如手腕部的八对腕骨。还有扁平骨及含气骨等,长在头上。人体不論作哪一种姿势,都用骨胳来支持。許多内部器官都由骨胳包围着,例如脑的外面是脑顱,心脏、肺脏等的外面有胸廓。在这里,骨胳起着保护的作用。人体上的某一部分肌肉收縮的时候,跟肌肉相連的那部分骨胳就变更位置,發生运动。所以,骨胳和肌肉的共同协作,是完成运动不可缺少的
The body’s bones are about 206 in size. The largest is the femur (femur), and the smallest is the three ossicles in the ear. Bones have various shapes and names according to their functions. For example, the long bones are called long bones, the iliac bones, ulna bones and tibias of the upper limbs, and the femurs, tibias and iliac bones of the lower limbs are long bones. Some bones are short called short bones, such as the eight pairs of wrists on the wrist. There are also flat bones and aerobic bones that grow on the head. Regardless of the posture of the human body, it is supported by bones. Many internal organs are surrounded by bones. For example, the outside of the brain is a brain skull, and the outside of the heart, lungs, etc. has a thorax. Here, the skeleton plays a protective role. When a part of the body’s muscles contracts, the part of the bone that is connected to the muscle changes its position and moves. Therefore, the joint cooperation between bones and muscles is indispensable to complete the exercise.