2. The ears are located behind the eyes. It has the function of distinguishing vibration, and can convert the sound emitted by vibration into nerve signals, and then transmit them to the brain. In the brain, these signals are translated into words, music and other sounds that we can understand.
3. Eyes (also called eyes, eyes) are organs that can perceive light. The simplest eye structure can detect the brightness of the surrounding environment, and the more complex eye structure can provide vision.
4. The hand is a part of the front end of the arm of human or other primates. It consists of five fingers and palms, and is mainly used to hold things. Both hands are symmetrical and mirror images of each other.
5. Foot, that is, the moving object at the bottom of human leg, consists of five toes, sole and instep. Organs necessary for walking.
The structure of the foot, exquisite, is called "anatomical miracle" by physiologists!
People have 26 bones on each foot. There are 33 joints, 20 muscles of different sizes, 1 14 strong ligaments, countless sensitive nerves and abundant blood vessels. In the third to fourth week of embryonic period, people have enough productive capacity. A few months after giving birth, your feet can stand upright. You can leave in a year or so.
6. People can eat, sleep and work. Man is defined as a creature who can use language, has complex social organization and scientific and technological development, especially can establish groups and institutions to achieve mutual support and help. China ancient history books defined people as animals, which can be used as a mirror of introspection.