PNB 2XB3 Study Guide - Comprehensive Final Exam Guide - Wireless Access Point, Squid, Spinal Cord

• School: McMaster University
• Department: Psychology, Neuroscience & Behaviour
• Course: PNB 2XB3
• Professor: Dr. Daniel Goldreich

Document Summary

Astrocyte maintain ionic environment (right concentration of ions in the neuron: 2. Oligodendrocyte myelinate neuron (adds myelin sheath to axons of neurons) allowing neurons to send action potentials down faster: 3. Microglia scavenge cellular debris and suck the dead cells to keep environment clean. Ion transporters active transporters that actively move selected ions against the concentration gradient and they create ion concentration gradients; requires. The k+ concentration is greater inside than outside the neuron due to the action of the. At rest, the neuron is primarily permeable to k+, because the membrane contains k+ leak ion channels: 3. So k+ diffuses out of the cell, making the inside negative: electrochemical equilibrium. Diffusion: k+ diffuses out of the cell, down its concentration gradient: 2. Electrostatic force: as k+ diffuses out, the inside becomes negative compared to the outside. This makes the inside negative, counteracting the diffusion tendency (since opposite charges attract).