Lecture 24 Basics: Neuroanatomy

24.1 Neuron anatomy:

24.2 Resting Membrane Potential

Establishing a resting membrane potential

Membrane potential: _________________________________

Depolarization and Hyperpolarization

The Action Potential

Three new channels:

The action potential:

Resting… ligand binds

Depolarization, Rising, Falling, Undershoot Phases

Conduction of an action potential:

Class Notes:

How will the following changes to a normal neuron affect its membrane potential? Use the following diagram to picture the changes.

A normal cell:

A stretch receptor in the quadriceps muscle is triggered by the patellar reflex test, opening a stretch-sensitive sodium channel.

The drug A1899 blocks the leaky potassium channel

A the neurotransmitter GABA (gamma-aminobutyric acid) opens a chloride channel

Action potentials:

The following is practice for the questions often seen in the short answer of a Bio 93 exam. Have an instructor check your answer for clarity.

The genetic disorder Paramyotonia congenita causes prolonged depolarization in muscle cell membranes. Which of the following processes is most likely to be defective? MTOMBC

A. Closing of the voltage-gated sodium channel

B. Opening of the voltage-gated sodium channel

C. Opening of the voltage gated potassium channel

D. Closing of the voltage gated potassium channel

Answer

True or false

Explanation

A

B

C

D

Lecture 24 Page 1