[Psychology 2221B] - Final Exam Guide - Everything you need to know! (75 pages long)

• School: Western University
• Department: Psychology
• Course: Psychology 2221B
• Professor: Shelley Cross- Mellor

Document Summary

Resting membrane potential: membrane potential- difference in electrical charge between the inside and outside of cell. Recording the membrane potential: tip electrode inside neuron (pierce neural membrane without piercing) and tip outside in extracellular fluid: microelectrodes- intracellular electrodes, tips led one-thousandth mm diameter resting potential= -70 mv (inside)- polarized. Na+:2 k+: transporters= sodium-potassium pumps, transporters- mechanisms membrane cell actively transport ions/ molecules across membrane several other classes discovered. Inhibitory synapse activated twice rapid succession can produce greater ipsp: synapses near axon trigger zone assumed most influence firing of neurons some mechanism amplifying dendritic signals originate far from axon initial segments. Conduction of action potentials: voltage-activated ion channels- ion channels that open/ close in response to changes in level membrane potential. Conduction in myelinated axons: nodes of ranvier- gaps between adjacent myelin segments- myelinated axons ions only pass through, ap myelinated axon, signal conducted passively along first segment myelin to next node.