Psychology 1000 Chapter 3: Psych Chapter 3 Notes

• School: Western University
• Department: Psychology
• Course: Psychology 1000
• Professor: Dr.Mike

Document Summary

Each axon may connect with dendritic branches from other neurons, making it possible for a single neuron to pass messages to. 50000 other neurons: more than 200 different types of neurons have been identified, neuronbeing formed in prenatal brain development, glial cells also protect the brains from toxins. Blood-brain barrier prevents many substances from entering the brain. At rest, the neuron has an electrical resting potential due to the distribution of positively and negatively charged chemicals inside and outside the neuron. When stimulated, a flow of ions in and out through the cell membrane reverses the electrical charge of the resting potential, producing an action potential, or nerve impulse. Attracted by negative proteins ions inside, positively charged na+ flood into the axon, creating a state of depolarization. Is like plastic insulation on wire: myelin sheath is regularly interrupted by the nodes of. Ranvier, where the myelin is either extremely thin or absent.