Psychology 1000 Study Guide - Midterm Guide: Brainstem, Sensory Cortex, Basal Ganglia

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

Document Summary

100 billion at birth, lose 10 000 every day. Cell body or soma biochemical structures that keep the neuron alive. Nucleus carries genetic information that determines how the cell develops. &functions: dendrites-->collect messages from other neurons &send them to the cell body. Branch-like fibres that emerge from the cell body: axon sends electrical impulses to other neurons, muscles, glands. Glial cells hold neurons in place, make food for neurons, absorb toxins: also manufacture nutrients, form myelin sheath, absorb toxins &waste, guide newly divided neurons to place in brain during development. Neurons surrounded by salty liquid environment: high concentration of sodium (na+) o. Inside of neuron is more negative, causing it to be more electrically negative: resting potential across the membrane: -70 mv. Action potential (nerve impulse) is a sudden reversal in neuron"s membrane voltage: depolarization changes from -70 mv to +40mv, graded potentials changes proportional to the amount of incoming stimulation.