KIN 2500 : Test 5 Notes

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Nervous system: cns (central nervous system, brain and spinal cord. Nervous system functions: sensory: all information derived or received by the body is done by the sensory part of the nervous system; collects it and brings it in. Myelination process: schwann cell approaches axon and begins to wrap itself around, when finished, the myelin sheath is the many, many wrappings of the schwann cells. Involves opening of chemically-gated na+ channels: threshold firing level: point where depolarization becomes self-propagating (approx. Involves opening of voltage-gated na+ channels and sodium pours in in great quantities: action potential: large depolarization; total amplitude 100 millivolts, repolarization: return to rmp. Synapse: presynaptic neuron: many deliver in a close fashion and can reach the nerve impulse and can reach the threshold firing level, synaptic cleft, postsynaptic cleft: caused by presynaptic clefts to fire. Synaptic arrangements and networks: 2 presynaptic neurons influencing one postsynaptic neuron: special summation, 1 presynaptic neuron influencing one postsynaptic neuron: temporal summation.

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