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Central Nervous System (Drugs (Alcohol, Anabolic Steroids, Cocaine,…
Central Nervous System
Major functions
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Motor Function- it may respond to stimuli by initiating muscular contractions or glandular secretions
Layers of the meninges
Dura Mater- outermost layer, made of dense irregular C.T. with many blood vessels & nerves, attached to periostem
Arachnoid Mate-spider web-like collagen and elastic fiber, thin membrane that lacks blood vessels
Pia Mater- innermost, nearly transparent layer, follows contours of brain and spinal cord
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Action potential
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strong stimulation or nerve impulse causes sodium gates to open and it rushes into the cell causing depolarization.
if strong enough depolarization occur, then threshold potential is reached and impulse it sent down axon
potassium then rushes out of the neuron after sodium rushes in and that cause repolarization of the membrane back to resting poyential