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TEST 3 - TEST3 I. muscles. A.(nameddue tothefactthatiti

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Picture 4 TEST 3  I. The nervous system - it allows us to detect the world around us and move our  muscles. Your brain sends electrical signals to muscles and other parts of the  body that tell your body what to do and how to react. A. The central nervous system - the brain and the spinal cord. (named due  to the fact that it is the nerve system in the center of your body) – processes,  evaluates, and organizes  B. The peripheral nervous system - nerves that connect to your hands  and extremities; also the nerves that run your organs – perform behavior,  regulate body
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Picture 1 1. The somatic nervous system - voluntary movement any thing you control –  skin, muscles, and joints 1. The autonomic nervous system - all involuntary movement or function so,  stomach, heart, glands, lungs, etc.; somatic sensory is in this system - the  feeling of being full; anxious  a. Sympathetic nervous system - part of the body that helps  you in a danger situation so it sets off adrenalin and helps the fight  or flight response--this is when epinephrine increases heart rate  and blood sugar level b. Parasympathetic nervous system - slows down some  parts of your body after the fight or flight like heart rate but speeds  up other parts of your body like digestion 1I. The Neuron- the “building block” of the nervous system. This is a nerve cell that  collectively makes up the nervous system. It is by far the most metabolically  active of any cells. Neurons “fire” which means that they send an electrical signal  through the neuron and into the next one, all the way to the brain. This happens  so your body can be aware of touch, pain, movement, etc. -- collect, process, and  send information to other neurons Three types: afferent (sensory), efferent (motor), interneurons Sensory nerves - inward; nerves that travel through your  body and send an electrical signal to your brain letting it know what is  happening. (Example: touch a hot pot, your sensory nerves let your  brain know it its hot)
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Motor nerve - outward; this nerve goes from your brain to  your muscles and organs so they can react. (Example: same pot has  been touched so your brain sends a signal through the motor nerves to  move your hand away from danger. It does this in response to the  sensory nerves.)  Afferent or Efferent?
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