PSY-1200 Lecture Notes - Lecture 4: Dendrite, Myelin, Opiate
Document Summary
De ned as complex network of cells that tells us what going on outside and inside the body and to respond appropriately. Three most basic functions of cns: input, processing, output. Neuron: fundamental unit of the nervous system. Axon: bers in the neuron that carry signals from the cell body out to where communication with neurons occur. Dendrite: receives signals from other neurons and carries them to cell body. Step 2: neuron responds and sends a message to the next neuron: action potential- electro-chemical restorm", positive and negative charged ions exchanged, inside to outside & vise-versa (depolarization) Depolarization causes gates: to open and close, creating electrical impulse/ rush . Speed depends on diameter of axon - the larger the axon the faster the speed - and presence of myelin. Synapse: microscopic gap b/t axon terminals of the sending neuron and the dendrites of receiving neuron. Delivered from vesicles in axon terminals to receptors in receiving dendrite.
