BIO1022 Lecture Notes - Lecture 9: Central Nervous System, Motor Neuron, Sensory Neuron

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Information processing: sensory input > integration(brain or cns) > motor output. Glia supporting cells (the neurons cannot work without glial cells) Signalling system(specificity): endocrine system and nervous system (have short memory, if want to learn must keep sending signal all the time) Sensor-sensory input-integration-motor output-effector: cell body near middle of axon, in central nervous system. The axon of sensory neuron and motor neuron are both long. Ungated ion channels allow ions to diffuse across plasma membrane. Sodium-potassium pump transports theses ions against their concentration gradients. Open or close in response to one of three kinds of stimuli: stretch-gated ion channels open when membranes deformed, chemically-gated ion channels respond to a chemical stimulus found in synapses, voltage-gated ion channels. Respond to a change in membrane potential found in axons (and dendrites) Stimulus triggers increase in magnitude of membrane potential (more negative) channels. Stimulus triggers decrease in magnitude of membrane potential (less negative) Refractory period ensures impulse is unidirectional (cid:2)(cid:4)(cid:5)(cid:6) (cid:1) (cid:1)

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