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Central Nervous System (drugs that affect brain (Heroine (inhibit dopamine…
Central Nervous System
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layers of meningies
dura mater
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dense, irregular c.t with many blood vessels and nerves
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pia mater
innermost,nearly transparent layer;has many nerves and blood vessels
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spaces and ventricles
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lateral ventricles-located by the two halves of the brain,sends and recieves messages from the lateral vertices and contains cerebrospinal fluid
fourth ventricle
upper portion of medulla, diamond shaped
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tissues
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dendrites-receding portions, short tapered and highly branched
axons start as a single fiber , but may give off branches called collateral axon
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action potential
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strong enough stimulation or nerve impulse cause Na+ gates to open Na+ rush into cell causing depolarization(membrane potential goes towards over unpolarized, and momentary becomes positively charged)
if a strong enough, depolarization occurs, threshold potential is reached (30+) and impulse is sent down axon
k+ rush out of neuron after Na+ rushin , which causes a depolarization of the membrane back to resting potential
drugs that affect brain
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Ecstasy
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affects mood, sleep,preception and appetite
Marijuana
receptors turn off the release of inhibitory neurotransmitters without inhibition ,dopamine can be released
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alcohol
glutamate acts as the brains general purpose excitory glutamate prevents glutamate from exciting cell
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