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The nervous system is very complex.
神經(jīng)系統(tǒng)十分復(fù)雜。
Its function is to control the body and its communications network.
起作用時控制機體及其反應(yīng)體系。
This communication process includes receiving information and responses.
這一反應(yīng)過程包括接受信息和做出反應(yīng)。
The basic function unit of the nervous system is the neuron.
神經(jīng)系統(tǒng)的基本功能單位是神經(jīng)元。
A neuron consists of 3 parts: the cell body, dendrites and the axon.
一個神經(jīng)元被分成三個部分：細(xì)胞體、樹突和軸突。
The cell body contains the nucleus.
細(xì)胞體內(nèi)有原子核。
Dendrites are short, branch-like projections.
樹突是一個較短，像樹枝一樣的凸起。
A neuron usually has several dendrites.
一個神經(jīng)元通常有幾個樹突。
Dendrites conduct or transmit impulses toward the nerve cell body.
感覺沖動通常通過樹突傳導(dǎo)給神經(jīng)細(xì)胞的細(xì)胞體。
An axon is a large single fiber.
軸突是一個單一的神經(jīng)纖維。
It extends from the cell body and carries impulses away from the cell to tissues or another neuron.
它從細(xì)胞體延伸出去，攜帶著感覺沖動傳導(dǎo)給其他組織或神經(jīng)元。
There are 2 kinds of neurons.
神經(jīng)元分為兩種。
Efferent neurons transmit impulses from the brain and spinal cord to muscles and glands.
傳出神經(jīng)元將感覺沖動傳輸給大腦、脊髓和腺體。
Sensory or afferent neurons convey impulses from receptors to the brain and spinal cord.
感覺神經(jīng)元，也稱傳入神經(jīng)元將感覺沖動從受體傳輸給大腦和脊髓。
The receptors are located in the skin and sense organs.
受體分布在皮膚和感覺器官上。
Beginning at the dendrite, impulses travel through a nerve, through the cell body and then through the axon.
感覺沖動從樹突開始，經(jīng)過神經(jīng)纖維傳輸給經(jīng)過胞體，然后傳給軸突。
At the end of the axon, the impulse passes through a synapse to the dendrites of another nerve cell.
在軸突的末端，沖動通過突觸傳輸給下一個神經(jīng)細(xì)胞的樹突。
The impulse continues to travel through that cell body and axon and then to a muscle or other organ.
沖動繼續(xù)在胞體和軸突之間傳導(dǎo)，然后到達(dá)肌肉或者其他器官。
Finally, the muscle or organ response to the impulse.
最后，肌肉和器官對沖動做出反應(yīng)。
The nerve cell that picks up impulses or sensations is a sensory nerve.
接受沖動或感覺的神經(jīng)細(xì)胞是感覺神經(jīng)。
The nerve cell that starts movement in response to sensation is a motor nerve.
使身體對感覺做出反應(yīng)的神經(jīng)細(xì)胞是運動神經(jīng)。
The process is very complicated.
這個過程十分復(fù)雜。
Someone has compared it to electricity or to a telephone system, but this is oversimplification.
有人將其比作電流和電話系統(tǒng)，但這是對它的一種過分簡化。
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