Nervous+System

Nervous System Neuron (http://www.daviddarling.info/encyclopedia/N/neuron.html) [Ben] Homeostasis is the maintenance of constant conditions in the internal environment of the body despite large swings in the external environment (Andy)  The  nervous system  and  homeostasis  have a negative feedback relationship  (Andy)  the  nervous system  responds to internal and external stimuli, or a deviation from the body's normal state. (Andy)  The nervous system is divided into two main systems, the central nervous system (CNS) and the peripheral nervous system (PNS). (Andy)
 * The spinal cord and the brain make up the CNS. Its main job is to get the information from the body and send out instructions. (Andy)
 * The peripheral nervous system (PNS) is made up of all of the nerves and the wiring. This system sends the messages from the brain to the rest of the body.(Andy)

While negative feedback maintain homeostasis and keep the body conditions stable, positive feedback does the opposite thing and increases the "rate of change away from the set points" (Nowicki 861) [Ben]. When 1 neuron send signals to another, the dendtrites of the other neurons will receive them and continue sending signals to another neuron (Nowicki 876) [Ben]. There are 3 types of neuron: sensory neurons, interneurons, and motor neurons (Nowicki 877) [Ben]. Sensory neurons and motor neurons are all belong to the peripheral nervous system (PNS) (Nowicki 889) [Ben]. When a neuron is stimulated, an electrical impulse called action potential moves down the axon and it contains neurotransmitters - chemical signals that let 1 neuron to stimulate another. When the electrical impulse reaches the axon terminal, neurotransmitters are released into the synapse - a gap between neurons (Nowicki 879) [Ben]. The peripheral nervous system is divided into 2 divisions. 1 is called the autonomic nervous system - 1 division in the peripheral nervous system that controls functions that are involuntary such as digestion (Nowicki 890) [Ben]. For more information about neurons, nerves, and neurotransmitter, you can go here [Ben] There are 3 major structures of nervous system: Interprets information, and the peripheral nervous system gathers and transmits information. <span style="font-family: Arial,Helvetica,sans-serif;">o Interconnected network of cells <span style="font-family: Arial,Helvetica,sans-serif;">o Signals move through cells  <span style="font-family: Arial,Helvetica,sans-serif;">o Divided into central nervous system (CNS) and peripheral nervous system (PNS) (Nowicki 875) [Polly]    **Nervous system <**[]> [Polly]

<span style="font-family: Arial,Helvetica,sans-serif; font-size: 11pt; line-height: 115%;">A stimulus causes a response. Responses can be chemical, cellular, or behavioral. The nervous and endocrine systems respond to stimuli. (Nowicki 874) [Polly] <span style="font-family: Arial,Helvetica,sans-serif; font-size: 15px; line-height: 17px;">Neurons are specialized cells that store information and carries messages within the nervous system and between other body systems. (Nowicki 876) [Polly] <span style="font-family: Arial,Helvetica,sans-serif; font-size: 15px; line-height: 17px;"> Neurons transmit information in the form of electrical and chemical impulses. Neurons is stimulated, it produces an electrical impulse that travels only within that neuron. Before the signal can move to the next cell, it changes into a chemical signal (Nervous System Information). CNS and PNS pass signals to each other. When the CNS passes impulse to PNS=> PNS stimulates response. When PNS passes the impulse to CNS=> CNS interprets impulse (Nervous System Information). The PNS is divided into 2 parts: Somatic nervous system and autonomic nervous system. The somatic nervous system: comprised of cranial nerves and spinal nerves. It supplies the muscular system and external receptors. Autonomic systems control the body internally. It comprised the sympathetic and parasympathetic nervous systems. It impulses the sensory organs to the brain, it also can increase or decrease the heart rates as a response of the body’s reaction of stress, stimulate... ( Nervous System Information). The reflex arc is to automatically do without any thinking. And the other responses are when it takes a while to think and it takes the signal a while to travels to the brain and then makes the body response to it (Nervous System Information). <span style="background-color: transparent; color: #000000; display: block; font-family: Times New Roman; font-size: 16px; text-align: left; text-decoration: none; vertical-align: auto;"><span style="background-color: transparent; color: black; font-family: Times New Roman; font-size: 16px; text-decoration: none; vertical-align: auto;">Neurons transmit information in the form of electrical and chemical impulses. Neurons is stimulated, it produces an electrical impulse that travels only within that neuron. Before the signal can move to the next cell, it changes into a chemical signal (Nervous System Information). CNS and PNS pass signals to each other. When the CNS passes impulse to PNS=> PNS stimulates response. When PNS passes the impulse to CNS=> CNS interprets impulse (Nervous System Information). The PNS is divided into 2 parts: Somatic nervous system and autonomic nervous system. The somatic nervous system: comprised of cranial nerves and spinal nerves. It supplies the muscular system and external receptors. Autonomic systems control the body internally. It comprised the sympathetic and parasympathetic nervous systems. It impulses the sensory organs to the brain, it also can increase or decrease the heart rates as a response of the body’s reaction of stress, stimulate... (<span style="background-color: transparent; color: black; font-family: Times New Roman; font-size: 16px; text-decoration: none; vertical-align: auto;">Nervous System Information). The reflex arc is to automatically do without any thinking. And the other responses are when it takes a while to think and it takes the signal a while to travels to the brain and then makes the body response to it (Nervous System Information). (Chris) <span style="background-color: transparent; color: #000000; font-family: Times New Roman; font-size: 16px; text-align: left; text-decoration: none; vertical-align: auto;"> "Brain (Pictures, Images, Photos, & Diagrams)." <span style="background-color: transparent; color: #000000; display: block; font-family: Times New Roman; font-size: 16px; text-align: left; text-decoration: none; vertical-align: auto;">AllRefer Health <span style="background-color: transparent; color: #000000; font-family: Times New Roman; font-size: 16px; text-align: left; text-decoration: none; vertical-align: auto;">. Web. 25 May 2011. <span style="background-color: transparent; color: #800080; font-family: Times New Roman; font-size: 16px; text-align: left; text-decoration: underline; vertical-align: auto;">[]. (Chris) "What Is the Nervous System?" <span style="background-color: transparent; color: #000000; display: block; font-family: Times New Roman; font-size: 16px; text-align: left; text-decoration: none; vertical-align: auto;">THE MEDICAL NEWS | from News-Medical.Net - Latest Medical News and Research from Around the World <span style="background-color: transparent; color: #000000; font-family: Times New Roman; font-size: 16px; text-align: left; text-decoration: none; vertical-align: auto;">. Web. 25 May 2011. <span style="background-color: transparent; color: #800080; font-family: Times New Roman; font-size: 16px; text-align: left; text-decoration: underline; vertical-align: auto;">[]. (Chris) For more information of nervous system, click <span style="background-color: transparent; color: #800080; font-family: Times New Roman; font-size: 16px; text-align: left; text-decoration: underline; vertical-align: auto;">here OR here