Neuophys: Resting Potential

Question 1

Neuron function

Answer 1

-Highly irritable
-Responds to adequate stimulus by generating action potential (impulse)

Question 2

Cell membrane

Answer 2

-Phospholipid bilayer (looks like stick figures)
-Membrane protein
-Fluid mosaic model
(ECF) = Out +++positive
(ICF) = In - - - Negative

Question 3

Membrane Ion Channels

Answer 3

Proteins in the membrane = ion channels

-Leakage = always open

-Gated = open based on certain stimuli

Question 4

Chemical Gradients

Answer 4

Ions move from high to low concentration

Question 5

Electrical gradient

Answer 5

Ions move toward opposite electrical charge

Question 6

Na+

Answer 6

Sodium always travels IN (SLIGHTLY permeable)

Question 7

K+

Answer 7

Potassium is always OUT (permeable)

Question 8

Polarized

Answer 8

More negatively charged inside than outside

Question 9

Cl-

Answer 9

Always OUT (permeable)
-Doesn’t need channel

Question 10

A-

Answer 10

Large anionic are negative protein (Impermeable)

Question 11

Describe the pump (RMP)

Answer 11

-Requires energy
-3 Na, 2 K 2
-Prevents leakage to stay at -70v