TEST 3 - Pictu re 4 TEST 3 I. The nervous system - it...

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Unformatted text preview: Pictu re 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 Pictu re 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) 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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TEST 3 - Pictu re 4 TEST 3 I. The nervous system - it...

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