BIOL 1080 Lecture Notes - Lecture 8: Central Nervous System, Multiple Sclerosis, Action Potential

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Central nervous system = brain and spinal cord. Parasympathetic: governs the bodily activities during restful conditions: digestion, urination (neurotransmitter: acetylcholine) Y(cid:373)patheti(cid:272): prepares (cid:271)ody for stress a(cid:374)d e(cid:373)erge(cid:374)(cid:272)y, (cid:862)fight or flight(cid:863) (neurotra(cid:374)s(cid:373)itter: Reflex arc: not all information goes directly to the brain. Brain still receives the information (memory) but receives it later. Step on a tack: reflex to pull foot away first, then your brain acknowledges the pain. 5 major cell types of the adult human cns: neurons. Action potential: na+ and k- change action potential, goes in one direction down the axon (away from cell body) There are specific neurotransmitters for specific target cells. Myelin sheath dramatically speeds up the action potential. One for each pre-synaptic neuron (dopamine, serotonin, norepinephrine, acetylcholine) Low dopamine, serotonin, norepinephrine are associated with depression. Neurons can be excitatory or inhibitory, and how the cell responds is the overall effect.

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