Nervous+system

Nervous system is a highly connected network of tissue, help you to think, work, move, sense, and control other organs (Nowicki 874). The cells that making up this entire complicate network are called __neurons.__

Looking at the picture in the left, the neuron cell looks like an antenna; the tree branches-like extension out of the cell body are call __Dendrites__, Its only job is to receive the messages form neighboring cells(Nowicki 876). Received the message, the cell send it through the __axon__ covering by the __myelin sheath__ and when it reach the ending tip of the axon which is calls terminal, the message will be send to another neuron cell. *Neuron cells are very unique, “Unlike other cells, neurons cannot replace themselves. Damage to neurons is permanent” (Articles). ||
 * [[image:Biology_project.gif width="507" height="350" align="left"]]
 * (Articles) ||

= = ("Peripheral Neuropathy" ) = =


 * The nervous system is made out of 2 parts; the Central Nervous system (CNS) and Peripheral nervous system (PNS). The CNS only compose of the brain and the spiral core, it acts like headquarter for the nervous system for itonly receives, judges and sends command to the PNS (Nowicki 885). On the other hand, PNS is only a series of nerves that connects to CNS and through out the whole body, its jobs are to detect __stimulus__ inside and outside the body using __Sensory neuron__ and report back to the CNS for respond (Nowicki 875). When received the message, a specific neuron from CNS calls __motor neuron__ will carry out the command from the CNS to targeted muscle or organs and base on the situation, each respond will be different (Nowicki 885). Although there is one special respond, called __Reflex arcs;__ it responds almost immediately when receptors make contact with outside influence, the reason for this is because it only need to travel to the spiral core and to receive unlike other which have to go all the way to the brain. ||

**+Signal and transferring signal in-depth**: When the message appears and travels down the axon, it is in a form of electrical impulse and calls __action potential__ (Nowicki 878). 2 ions are needed for this electrical impulse to happen, and they are call Na+ and K+. (tarwankin) || When there is no message transferring, the neuron remain in it __resting potential__, this resting potential occurs because there are unequal K+ and Na+ inside and outside the cell (Nowicki 877). When being hit, touch, sense, feel by the skin, receptors in the skin felt the pressure and send neuron cell an alarm (Sharp).Na+ rapidly come into the cell through __Active Transport,__ K+ flow out of the cell, an electrical impulse was create and rapidly moving down toward the axon terminal, *Every time the electrical impulse move past, the cell change back to resting potential*(Nowicki 879). When the impulse reaches the terminal, it cause the vesicles that holding //__neurotransmitters__// which is a chemical that stimulate other neuron by letting Na+ enter the cell (Nowicki 879). to merge and release it into __synapse__ (Nowicki 878). The neurotransmitter will then bind to the receptors on the neighboring neuron, active the cell to let Na+ in (Nowicki 878). ||
 * [[image:concgrad.jpg width="416" height="324"]]

Words definition:

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 * 1) __Action potential__: is when a electric signal goes through the neuron ( Nowicki 879)
 * 2) __Autonomic nervous system__: Are part of PNS but involuntary (Nowicki 890)
 * 3) __Axon terminal__: the end of the axon (Nowicki 879)
 * 4) __Axon__: a the long tail which carry electric impulse (send signal) (Nowicki 876)
 * 5) __central nervous system (CNS):__ is the nervous system that contain the brain and spiral core.(Nowicki 875)
 * 6) __Cerebellum__: is the small portion that maintain balance of the body ( Nowicki 888)
 * 7) __Cerebrum__: is the large part of the brain that control though, and interprets information to your brain (Nowicki 886)
 * 8) __Dendrite__: short branches spread, help to receive signal (Nowicki 876)
 * 9) __endocrine system__: are isolate organs, connect by blood stream and not the nervous system (Nowicki 874)
 * 10) __nervous system__: is a highly connected network of tissue, help you to think, work, move, sense, and control other organs. (Nowicki 874)
 * 11) __Neuron__: are the cells that make up the entire network; it composes of (Nowicki 876)
 * 12) __Neurotransmitter__: are chemical release into space when A.P (also called synapse) (Nowicki 879)
 * 13) __peripheral nervous system (PNS):__ connect CNS to every part of the body. (Nowicki 875)
 * 14) __Reflex arc__: are stimulus of the body without involving the brain to take command (Nowicki 889)
 * 15) __Somatic nervous system__: Are part of PNS that are voluntary (Nowicki 889)
 * 16) __Stimulus__: is a kind of respond of the body, keeping the body from being any harm ways (Nowicki 874)
 * 17) __Synapse__: the tiny space between 2 neurons (Nowicki 879)