ANP 1105 Lecture Notes - Lecture 4: Axon Terminal, Resting Potential, Chemical Synapse

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1105
• Professor: William Staines

Document Summary

Nerve cell have a high metabolic rate meaning they require a lot of glucose and oxygen. This part receives information and sends it towards the cell body. This part of the neuron conducts nerve impulses from the cell body. This is the part of the neuron that secretes neurotransmitters into the synaptic cleft. The electrical potential energy created by the separation of oppositely charged ions. Many neurons have an internal voltage of -70mv. When a neuron is polarized or at resting potential [k + ] and [a - ] are high inside the cell and [na + ] and. Depolarization: an action potential begins when a depolarization increases the membrane voltage so that it crosses a threshold value (usually around 55 mv). Action potential: at this threshold, voltage-gated na+ channels in the membrane open, allowing many sodium ions to rush into the cell.