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Title: Super System
Author: Crazy Xiao Qiang
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Words for introduction of nervous system materials: 12488
1, Introduction
Being able to respond to external stimuli is a common feature of cells, and this reaction is called stress.
Multicellular animals have a nervous system. The nervous system is composed of nerve cells or neurons with highly developed stress, and some special connective tissue cells, such as glial cells. Its function is to receive information from outside and inside the body through various senses, transmit it, interpret, sort out and process it, and then send out corresponding "instructions" to make relevant parts of the body respond, so as to keep all parts of the body harmonious and stable inside the body.
In addition to the nervous system, the endocrine system (secreting hormones) is also a system for coordinating and controlling various functional activities of the body. These two systems have their own characteristics. Hormones act more slowly than nerves. Growth, sex differentiation, food digestion and other activities are all regulated by hormones, which are slow but stable. The effect of nerve activity is quick. The rapid response of animals is generally guided and conducted by the nervous system. To test the muscle system. Nerve conduction speed is very fast, ...
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