Physiology 2130 Lecture Notes - Lecture 6: Primary Motor Cortex, Cerebral Hemisphere, Peripheral Nervous System

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If all cells laid out in line = 1000km = 600 miles: contains 10 100 billion cells and weighs ~1. 5 kilos (3. 5lbs, have more brain cells when born, action potentials (brain language) travel up to 400km/hr. The language of the nervous system and neural coding. Information travels down axons as action potential (action potential = language of nervous system: ex. Weight of object is coded into action potential the heavier the object, the more action potentials per second: called neural coding . Synaptic transmission: the chemical synapse: nerve cells communicate with one another by chemical synapses, neurotransmitter is released from the presynaptic nerve to affect the postsynaptic nerve, structure & process similar to neuromuscular junction. Neurotransmitter type: neurotransmitter then breaks down, taken by presynaptic cell to be used again and channels close. Depolarization: increases probability of ap on postsynaptic neuron. Hyperpolarization: decreases probability of ap on postsynaptic neuron.

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