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Two Subdivisions 1. Central Nervous System (CNS) 2. Brain Spinal cord Peripheral Nervous System (PNS) Nerves of the body CNS Controls the body Source of: Emotions Memory PNS Relays communication b/w brain and the body http://www.youtube.com/watch?v=cGSXaWJD75U http://www.youtube.com/watch?v=_vx1OVLX5Rc 1. Sensory 2. Integration 3. Gathers info Process Info Motor Responds to signals Maintains homeostasis 1. Neurons 2. Process info Neuroglia Support, nourish and protect Cell Body Contains nucleus Dendrite Receive signals Axon Sends signal along Synapse Site of communication Schwann Cells (PNS) Produce/maintains the myelin sheath for each axon Myelin sheath Increases the speed of nerve impulses Increase with age Why are babies less coordinated than adults? Determined by the # processes attached to the cell body Process Occurs at a synapse Neurotransmitters are released Chemical Messengers The process Neurotransmitter released and binds to receptor Response carried out http://www.youtube.co m/watch?v=ifD1YG07f B8 Resting Potential Action Potential What happens when the action potential reaches the axon terminal? Excitatory action potentials release of neurotransmitter Inhibitory action potentials release of neurotransmitter Causes feelings of euphoria Activates the pleasure center Both excitatory (elevates mood) and inhibitory (depression) 1. 2. 3. Was there a difference in the average distances between arms and fingers for the meter stick drop? Why do you think this is the case? How many hours of sleep did you get the night before our lab? Do you think there is correlation between reaction time and amount of sleep? Explain your reasoning. Was there a difference in average distance between neurons in the different areas tested on your body? a. Which was the shortest and which was the longest? Why do you think this is the case? Photoreceptors Specialized neurons in the eye Optic Nerve No photoreceptors No info to brain Brain “makes up” missing info