Psychology 1000 Chapter Notes - Chapter 3: Jerky, Acetylcholine, Multiple Sclerosis

• School: Western University
• Department: Psychology
• Course: Psychology 1000
• Professor: Laura Fazakas-de Hoog

Document Summary

Cell body(soma)- contains the structure needed to keep the neuron alive, genetic info. Dendrite- receive messages from neighbouring neurons and send them to cell body. Axon conducts electrical impulses away from the cell body to other neurons. Glial cells- surround neurons and hold them in place. Blood brain barrier= prevents toxins from entering the brain. Release chemicals that allow them to communicate with other neurons. High concentrations of: na+ and positive ions outside (salty) Action potential (depolarization) a sudde(cid:374) reversal i(cid:374) the (cid:374)euro(cid:374)"s (cid:373)e(cid:373)(cid:271)ra(cid:374)e voltage. A(cid:272)tio(cid:374) pote(cid:374)tial o(cid:272)(cid:272)ur at (cid:373)a(cid:454)i(cid:373)u(cid:373) pote(cid:374)tial or do(cid:374)"t o(cid:272)(cid:272)ur a(cid:374)(cid:455)(cid:373)ore. Must reach threshold value ( -50mv: graded potential= changes in the negative resting potential that do not reach threshold value. Myelin sheath- a fatty, whitish insulation layer derieved from glial cells during development. Ele(cid:272)tri(cid:272)al (cid:272)o(cid:374)du(cid:272)tio(cid:374) (cid:272)a(cid:374) skip fro(cid:373) (cid:374)ode to (cid:374)ode (cid:894)(cid:862)great leaps(cid:863)(cid:895) = highspeed. Damage: multiple sclerosis- o(cid:374)e"s i(cid:373)(cid:373)u(cid:374)e s(cid:455)ste(cid:373) atta(cid:272)ks (cid:373)(cid:455)eli(cid:374) sheath, disrupts the delicate timing of neurons= jerky, uncoordinated movements= paralysis.