PSYC 2240 Lecture Notes - Lecture 2: Fluid Mosaic Model, Axon Hillock, Membrane Potential

• School: York University
• Department: Psychology
• Course: PSYC 2240
• Professor: Joseph F X De Souza

Document Summary

Input zone (dendrites, cell body, nucleus); integration zone (axon hillock), conduction zone (axon), output zone (axon terminals) How long it take for neuron to fire and make action = approx. Efferent signals- signals from the brain towards effectors (ex. hand or eye) away from the. Afferent signals- signals from effectors towards the cns (ex. sensory feedback from skin) ** important neurons combine to make circuits; ex. knee jerk reflex: convergence (in) vs. divergence (out) ** important are positive feedback loops (inhibits neuron and shuts down) and negative feedback (though interneurons) loops. Threshold of excitation- the value of the membrane potential that must be reached to produce an action potential. Diffusion gradient- movement of molecules from region of high concentration to region of low concentration. Electrostatic gradient- molecules can carry charge (ions), cations (+ charge), anions (- (cid:272)ha(cid:396)ge(cid:895) these moves towards areas are unlike charge look to slides: (cid:858)(cid:373)e(cid:373)(cid:271)(cid:396)a(cid:374)e e(cid:395)uili(cid:271)(cid:396)iu(cid:373)(cid:859) Every neuron has resting charge/ resting potential(about -70)