Biology 449 - Animal Physiology September 10, 2008

Lecture 6 - Neurophysiology II

Membrane potentials (conclusion)

Goldman equation (cont'd)

Graded potentials

Action Potentials

Generation of A.P.'s

Description

Voltage-gated ion channels

Refractory period

Propagation of A.P.'s

Mechanism

Speed of conduction

 

Terms to Know

Leaky or “leak” channels

Graded potential
Action potential
Threshold potential

Depolarization
Repolarization
Hyperpolarization

Voltage-gated sodium channel
Voltage-gated potassium channel

Absolute refractory period
Relative refractory period

Cable properties

Myelin
Node of Ranvier
Saltatory conduction

 

Readings

Lecture 6:   Chapter 4, pages 114-122
Lecture 7:   Chapter 4, pages 122-137