PS101 Lecture Notes - Lecture 5: Frontal Lobe, Blood Sugar, Adrenal Gland
Document Summary
Neurons can respond to incoming chemical signals by becoming either depolarized or. When a neuron is at rest, it is negatively charged (around -70mv) inside (intracellular) relative to the outside (extracellular) Stimulus causes na+ channels to open na+ ions rush into the cell depolarized . Dendrites receive signal and pass it to the cell body. Sodium ions change the concentration inside of the cell. 65mv (threshold of excitation): na+ ions enter cell depolarize. 50mv (peak voltage): na+ channels close and na+ ions stay in cell; k+ channels open and k+ ions leave cell repolarize. Synaptic gap between axon terminal and dendrite. Every type of neurotransmitter has a different shape. Synaptic vesicles fuse with the axon membrane. Some receptors act to depolarize the nearby cell membrane. Other receptors act to increase the polarization of the nearby cell. Inhibitory input helps prevent the receiving cell from firing. Neurons decide whether to generate an action potential by adding up excitatory and.
