Information transmitted through the central nervous system tells our bodies how to react in a certain situation, such as when we want to take a step the brain tells our knee joint to bend, or when we touch something hot we receive information giving us a burning sensation. The CNS also sends information about infection so that the appropriate organ that can fight certain types of bacteria. It is a common misconception that the brain is the largest organ in the human body, when in fact it comes in at third largest after the skin and the liver respectively.
The central nervous system also controls our second system of the body, the cardiovascular system (also known as the circulatory system) which delivers blood and oxygen to the various parts of the body. The relationship between these two systems is quite complicated as each has an effect on the other. If we take the heart for example which is a key organ in the cardiovascular system, we can think that it feeds the brain and as such the CNS with oxygen and blood, but at the same time it is the brain that controls the heart telling it how often to beat.
transmit 传输
take a step 迈步
sensation 感觉
CNS = central nervous system 中枢神经系统
circulatory (血液/液体） 循环的
circulatory system 循环系统
