Nervous

 __Nervous System__ By: Daniel C, Alexis S, Jordan C, Megan Bo

**Functions:** 1) Controls the entire body and other systems 2) Controls respones to stimuli 3) Maintains homeostasis

** Parts: **
 * Central nervous system
 * Peripheral nervous system

**Organs: **
 * Brain
 * Spinal Cord
 * Nerve Cells

**Diseases/Problems:**  1) **Stroke** -The sudden death of brain cells due to a lack of oxygen. A stroke occurs when blood flow to the brain is blocked in an artery to the brain.  2) **Paralyzed**  -When any part of the spinal cord is damaged. For example, if your spinal cord is damaged in the middle, everything below it will be paralyzed. 3) aminesia ﻿-where the memory is lost.

The Central Nervous System (CNS): <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 180%;">The Central Nervous System contains the brain and spinal cord.

<span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">**The brain:**

<span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">The Brain is the "Boss" of the body. It is protected by the skull and the cerebral spinal fulid. Their are two sides, the left and right hemispheres. The left side of the brain controls the right side of the body and the right side if the brain controls the left side of the body.Brain cells CANNOT grow back if damaged. A stroke results when blood flow to the brain is blocked and the brain cells die due to the lack of oxygen!





<span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">Cerebrum- Controls memory, thinking, learning and the 5 senses and is the largest area of the brain. <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">Cerebellum- controls muscle movement and coordination. <span style="color: #0000ff; font-family: 'Comic Sans MS',cursive; font-size: 140%;">Brain stem(a.k.a. the medulla)-controls involuntary processes.

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<span style="color: #c4ac31; font-family: 'Courier New',Courier,monospace; font-size: 150%;">**The Spinal Cord:** <span style="color: #c4ac31; font-family: 'Courier New',Courier,monospace; font-size: 150%;">A bundle of thick nerves that connects brain to neurons. The spinal cord is protected by the vertebrae. Controls reflex actions. If damaged you could become paralyzed.

<span style="color: #ff0006; font-family: Impact,Charcoal,sans-serif; font-size: 140%;">Peripheral Nevous System(PNS): The Peripheral nervous system is made up by nerve cells.

<span style="color: #ff0006; font-family: Impact,Charcoal,sans-serif; font-size: 140%;">Nerve Cells:
 * <span style="color: #ff0006; font-family: Impact,Charcoal,sans-serif; font-size: 140%;">Nerve cells are also called neurons.
 * <span style="color: #ff0006; font-family: Impact,Charcoal,sans-serif; font-size: 140%;">They carry messages to and from the brain and body.
 * <span style="color: #ff0006; font-family: Impact,Charcoal,sans-serif; font-size: 140%;">These messages travel between neurons as electrical impulses like "telepho﻿ne wires."
 * <span style="color: #ff0006; font-family: Impact,Charcoal,sans-serif; font-size: 140%;">Their are two types of neurons the, sensory and motor.
 * <span style="color: #ff0006; font-family: Impact,Charcoal,sans-serif; font-size: 140%;">A stimulus from outside the body leads to a reaction which can either be voluntary or involuntary.



<span style="color: #ff0006; font-family: Impact,Charcoal,sans-serif; font-size: 140%;">Neurons working together: Neurons are working together to send a message to the brain to tell a body part to do something.

<span style="color: #ff0006; display: block; font-family: Impact,Charcoal,sans-serif; font-size: 140%; text-align: left;">How nerve cells work together: media type="youtube" key="Qo3BoxUhgzQ" height="351" width="432" align="center"

<span style="color: #ff0006; font-family: Impact,Charcoal,sans-serif; font-size: 140%;">The neurons use neurotransmitters in the sending of messages from one neuron to another.

<span style="color: #ff0006; font-family: Impact,Charcoal,sans-serif; font-size: 140%;">Nerve cells in your hand:

<span style="color: #ff0006; font-family: Impact,Charcoal,sans-serif; font-size: 140%;">These Nerve cells in your hand let you know when something is hot. When you touch the object, nerve cells in your hand send a message to the brain telling your hand to back away from this object.

The Whole Nervous System:



How the Nervous system works:

media type="youtube" key="z6t9Yss45VI" height="331" width="406" align="center"

[]
 * The nervous system controls all the activities by sending messages from the brain to the parts of the body and vice versa.
 * The Nervous System works with the help of neurons that send messages throughout the two parts of the Nervous System, the Central and Peripheral Nervous System.
 * The neurons can be sensory or motor neurons.
 * The sensory neurons send the stimuli from sensory organs like the eye, nose and skin, to the central nervous system. The brain processes these stimuli and sends them back to the other parts of the body telling them to react to the stimulus.
 * The motor neurons are responsible for receiving signals from the brain and spinal cord and sending them to the other organs of the body.
 * The Nervous System also works with the Endocrine System to maintain homeostasis.

How to keep your nervous system healthy:

[]  Wear a helmet when riding a bike, or any other sport that requires head protection! Don't do drugs, consume alcholal, or smoke. And also  do activities that challenge the brain. Such as  puzzles, reading, playing music, making art, or anything   else that gives the brain an exercise! -//<span style="color: #0000ff; font-family: Arial,Helvetica,sans-serif;">KidsHealth. //  //<span style="color: #0000ff; font-family: Arial,Helvetica,sans-serif;">[] //

Why the nervous system is so important: The nervous system is important because it sends message's to the brain then recives them back with a response. Without the nervous system we would not have a heart beat because the heart would not recive the message to beat every second. If we did not have our nervous system we could not feel pain,wich you might think is good,but is a very bad thing. It is bad because you would not tell when soemthing was wrong with you. Like for example, without the nervous system you could have a broken finger,toe etc. and not know it and you could still move it without pain and if you moved it, it would make your finger worse to the point of internally bleeding to the point of death.