PSYC 111 Lecture Notes - Lecture 25: Cerebral Circulation, Myelin, Neurogenesis
Document Summary
Keeps the (cid:374)euro(cid:374) li(cid:272)e; de(cid:272)ides (cid:449)hether the (cid:374)euro(cid:374) (cid:449)ill (cid:858)fire(cid:859) Fiber that conducts impulses away from the cell body. An electrical pulse that travels from the cell body to the axon terminal. The resting potential of a neuron is -70 mv. Excitatory signals increase the charge; inhibitory signals decrease the charge. Operates according to the all or none principal. Neurons can fire with varying frequency but not varying intensity. Increases the 100-fold speed of the action potential. Chemical substances that travel form one neuron to another. Are released when the action potential reaches the axon terminals. Bind with the receptor sites on the dendrites of another neuron. Unused neurotransmitters are reabsorbed (reuptake) or destroyed chemically. Serotonin: involved in mood. (low levels are associated with depression) Norepinephrine: involved in waking up from sleep. (sleeping pills block this) Dopamine: involved in voluntary movement. (low levels are associated with. A(cid:272)et(cid:455)l(cid:272)holi(cid:374)e: i(cid:374)(cid:448)ol(cid:448)ed (cid:449)ith (cid:373)e(cid:373)or(cid:455). (cid:894)lo(cid:449) le(cid:448)els asso(cid:272)iated (cid:449)ith alzhei(cid:373)er(cid:859)s(cid:895)
