Nervous+System

=Nervous System=

Introduction
Human body has a very complex and inside our body are significant systems that control, support our life such as fluid balance, temperature, nutrients… The //nervous s////ystem// is one of those systems, which carries a function as a communication with other organs, cells, tissues. So that they can respond the body’s needs, to maintain //homeostasis//. Beside the //nervous system//, the //endocrine system// can also help to maintain homeostasis by detect  something that causes a response from the body called //stimulus// //(Nowicky) [Bao]//.

Homeostasis
//Homeostasis // is the regulation and maintenance of the environment inside organisms ’  body or the internal environment. The conditions in body must be in a narrow range so //homeostasis// involves keeping internal environment in established range.( Nowicky) [Luan]

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Major Structures
The nervous system has to main parts: the central nervo us system (CNS) and the peripheral nervous system (PNS). The PNS gathers information from things around you, and then it transmits the information to the CNS. Then the CNS interprets the information and decides on a response (Nowicky) [Andy Tran].

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Neurons are specialized cells in communication in both electrical and chemical (Nowicky) [A ndy Tran]. //Neuron// has three parts: 1. Cell body has //nucleus// and //organelles// 2. // Dendrites // receive impulses 3. // Axons // carry impulses //Neutrons// also have other structures to transmit signal like //Schwann cells, Synapse, Terminal //( Nowicky) [Luan]

There are 3 types of neurons, which are the cells of nervous system; there are interneurons in the central nervous system (CNS). Sensory neurons and motor neurons are part of peripheral nervous system (PNS). Sensory neurons detect stimuli, and then send signal to CNS, while motor neurons take messages from the CNS and transport them to the muscles or organs. //Axon// is a long extension part, which is a part of the neuron where electrical impulse travel. And any signals that travel down the axon are electrical impulse called //actio////n potential (Nowicky) [Bao].//

Interaction
The CNS and PNS passes signal between one another: Sensory receptor generates impulse à PNS passes impulse to CNS à CNS interprets impulse à CNS passes impulse to PNS à PNS stimulates a response. The // reflex arcs // are nerve pathways that need to cross only two synapse before producing a response. The //reflex arcs// react more quickly than other response because the signal never has to travel up the //spinal c////ord// to the brain ( Nowic ky) [Luan]

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