The busiest thing for the human body is probably the mouth. Whether you bite, eat, swallow, inhale, breathe, talk or sing, you can't leave your mouth for a moment. Mouth is also indispensable in expressing feelings.

2. The ears can hear the sound.

Ear is located at the back of the eye, which 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 can see things and enjoy the scenery.

Objective light can be perceive, that simplest eye structure can detect the brightness of the surround environment, and the more complex eye structure can provide vision.

4. Hands can do many actions, such as patting, hitting, grasping, taking and throwing.

The hand consists of five fingers and palms, which are mainly used to hold things. Both hands are symmetrical and mirror images of each other. The five fingers can bend inward and swing slightly from side to side. Human beings make different gestures by bending their fingers, including making fists with five fingers, V-shaped gestures with index finger and middle finger raised, indecent gestures with middle finger raised, and so on.

5, enough to walk, run, jump, take yourself to climb the peak, take a walk in the grassland, etc.

Foot is composed of five toes, sole and instep, which is an essential organ for walking.