Neuron - Neuron functional unit of nervous system Dendrites...

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Neuron – functional unit of nervous system Dendrites – receive impulses, carry impulse to the cell body Axon – sends impulses Myelin sheath – produced by Schwann cell Cell body – contains nucleus Receptors Light – photoreceptors Chemical: smell/taste chemoreceptors Sound, touch, stretch, pain mechanoreceptors/Baroreceptors Sensory neuron – brings impulses to brain or spinal cord Motor neuron – originates in brain or spinal cord, effects a response in body organs (muscles or glands) How do neurons work? Polarization – positive on the outside Depolarization – positive on the inside Nerve impulse – when depolarization occurs Sodium potassium pump hypothesis Active transport system that charges the nerve cell membrane Synapse – makes sure that impulses travel in only one direction Acetylcholine – neurotransmitter used between neurons and skeletal muscles Sensory receptor sensory input integration motor output effector Sympathetic stress response Parasympathetic calms sympathetic 1/3
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Neuron - Neuron functional unit of nervous system Dendrites...

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