PSB-2000 Chapter Notes - Chapter 4: Catecholamine, Exocytosis, Autoreceptor
Document Summary
Random motion: particles tend to move up and down their concentration gradient. Ions move in and out thru ion - specific channels. The potential at which there is no net movement of an ion; the potential it will move to achieve when allowed to move freely. (na+= 120mv. Na+ is driven in by both electrostatic forces and its concentration gradient. K+ is driven in by electrostatic forces and out by its concentration gradient. Sodium potassium pump: active (uses atp) force that exchanges 3 na+ inside for 2 k+ outside. There are 3 factors that influence the distribution of na+ and k+ ions across the neural membrane *check picture labeled 3 factors at the bottom* Neurotransmitters bind at postsynaptic receptors, when they bind they create electrical changes. Epsps and ipsps travel passively from their site of generation, decremental (graded)-they get smaller as they travel. One epsp won"t cause a neuron to fire (release neurotransmitter) summation needed.
