Psychology-- CHAPTER 2.pdf - Tuesday PSYCHOLOGY chapter 2 The Nervous System On Being Wired Neurons • Nervous system built up of neurons • Neurons

Psychology-- CHAPTER 2.pdf - Tuesday PSYCHOLOGY chapter 2...

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Tuesday, August 28, 2018 PSYCHOLOGY chapter 2 The Nervous System: On Being Wired - Neurons Nervous system built up of neurons Neurons are little nerve cells Largest part of the neuron is the SOMA - SOMA means body Body of the cell In the body there is the nucleus - Nucleus is the control center - Tells the neuron what to do overall Nucleus gets its information from a bunch of dendrites - Gathers signals from other neurons - Gather any chemical they can (around them) Nucleus tells the cell to fire - If it fires goes through axon - Axon terminal is where the neuron releases its chemical signals All neurons have all of the parts except some don’t have the myelin - Myelin Neuron is an electrical cord The myelin is the insulation for the axon (the rubber around the electrical cord) Prevents interference sends signals faster Neurons with myelin are quicker than those that don’t - A ff erent and e ff erent neurons Some carry signals to central nervous system 1
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Tuesday, August 28, 2018 - Sensory or a ff erent Picking up information from outside world Fingers typing on keyboard Carrying them out from the central nervous system - Motor or e ff erent The movement Your brain sends signals to your hands or feet to move from the central nervous system SAME - Sensory - A ff erent - Motor - E ff erent - The neural impulse From dendrites to axon terminal - Dendrites to nucleus - Nucleus says to go to axon terminal Two Di ff erent Speeds - 2 to 225 mph The neurons that have myelin move at 225 mph Slower because it has to conduct change in each of the segments - The neural impulse: how the action potential works When the neuron is firing that is action potential Three di ff erent types of electrical charge particles - Sodium (Na) On the outside floating around 2
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Tuesday, August 28, 2018 Positively charge - Potassium (K) Inside the Neuron Positively charged - Electrons Negative - Resting potential (-70 mV) Important - When info comes in and tells neuron to fire Resting potential to action potential - It starts by opening sodium channels and then the sodium is attracted to negative charge go electrons inside neurons - Makes the charge now positive Called depolarization (+30mV) - Not where it wants to be - It wants to get back to -70 mV - It opens a second channel which only fires the potassium ions Potassium is pulled out of the neuron which is called repolarization (-70mV) - It is now back to the charge it wants to be - The negative side opens up and pulls the potassium back in and gets rid of some of the sodium and is now back to the resting potential and is ready to start firing again - The neural impulse : triggering the action potential Scary toilet - Incoming messages have to be strong enough to push the hand so it will flush - Always flushes at the same rate 3
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