Exam 4 lecture 26.5,27,28

Question 1

Parts of neuron

Answer 1

1. Dendrites
2. Soma/cell body
3. Axon hillock
4. Axon
5. Myelin sheath (Schwann cells)/nodes of Ranvier
6. Axon terminal

Question 2

Neuronal signals

Answer 2

1. Long distance signals: Electrical, within cell
2. Short distance signals: Chemical, between cells

Question 3

Potential energy

Answer 3

-Chemical gradients are not influenced by other molecules
-Cells store energy in these gradients

Question 4

Electrochemical gradients

Answer 4

-Cell membrane separates charge

-Ions distributed unequally across membrane

Question 5

Chemical gradient

Answer 5

Goes high to low

1 type

Question 6

Charge gradient

Answer 6

Goes to equal charge
- to +

Question 7

Equilibrium potential

Answer 7

-Concentration gradient exactly balances the electrical gradient for that ion

Question 8

Nernst equation

Answer 8

Eion = 62/ Z * log( [out]/[in]

Z = charge

-At equilibrium Vm = Eion
-Answer is the point at equillibrium, will move until M.P = that #
-Can find which way its moving based on charge