ANP 1106 Chapter Notes - Chapter 11: Electrochemical Gradient, Axon Hillock, Resting Potential

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1106
• Professor: Jackie Carnegie

Document Summary

Nerve impulse and synaptic transmission: 73-75, 78-80, 395-420. Nerve impulse - neurons are excitable, they are responsive to stimuli by showing depolarization. Some ion molecules in the body (na+, k+, ca2+, cl-) have electrical charge and are unevenly distributed across the cell membraned, this creates a charge separation that results in potential energy (voltage) Voltage: a charge separation energy measured btwn two point, aka a potential; potential energy reslting from separation of oppositely charged particles: biological potentials have voltages ranging from -90 to -70 but under special circumstances can jump to. Insulators have high resistance; conductors have low resistance decrease in resistance = an increase in conductance that permits current flow. Electrical force increases with the quantity of charge (more +ve and ve ions), and increases with decreasing distance of charge separation (when +ve and ve ions are closer to each other) Plasma membrane is polarized intracellular fluid is more ve (-70mv; more k+) than the extracellular fluid (more.