A. heavy B shape C be used to D. electricity E. flexible |
A. symbol B. exists C. careful with D. usually E. connected with |
Brain The brain allows us to experience the outside world. We remember, have feelings, solve problems, and control our bodies in our brain. Nerves (神经) from our senses send signals to the brain to let the brain know what is going on in the outside world. The brain also sends signals to muscles by using nerves in order to make our body move. The brain may not move, but it needs lots of energy. Energy is sent to the brain by blood. The brain actually uses around 20% of the body's energy. | Skin We all have skin. It covers our whole body and lets the good things in and the bad things out. It's our first line of protection against the outside environment. Just like our eyes, nose, and ears, it house one of our five senses. It also absorbs sunlight for vitamin D and heat. |
Muscles (肌肉) Muscles are how we move and live. All movement in the body is controlled by muscles. Skeletal muscles help us to move around. Smooth muscles control organs within our body, Cardiac muscle is special. It can pump our heart and blood. | ![]() |