The nerve impulse

Question 1

Neurons estbalish ________ _________ between the inside and outside of the cell membrane. This is used to generate a ____________.

Answer 1

voltage difference
neural impulse

Question 2

Nerve conduction depends on what?
What is membrane potential?

Answer 2

-the movement of ions across the membrane of an axon
-the charge seperaton across the membrane/ potential energy

Question 3

Resting membrane potential
-what is it (deffinition)
-what is it’s value
-is the inside or outside negative

Answer 3

-the potential difference across the membrane in a resting neuron
- (-70mV)
-inside

Question 4

What is polarization

Answer 4

process of generating a resting membrane potential.

Question 5

Excitation of the Neuron
-What is another word for nerve impulses, and where does it occur specifically in the neuron and sensory cells
-how is the nerve impulse established

Answer 5

-action potential in the axon or dendrites of sensory cells
-once the resting potential is depolarized to create an electrical current

Question 6

Intercellular fluid
-what does it contain (2)

Answer 6

-large negativley charged proteins
-small negativley charged Cl- ions

Question 7

Sodium Postassium Exchange Pump
-what does it use and pump
-where does the excess postive charge accumulate

Answer 7

-uses ATP to pump 3Na+ out of the axon and 2K+ into the axon
-outside the cell

Question 8

Since some ion channels are always open, what happens?

Answer 8

Ions diffuse down their concentration gradient

Question 9

What 3 things does the cell membrane contain?
-name, what they’re stiumulated by, how they move ions across

Answer 9

1. non voltage ion channels
   -chemicals
   -diffusion
2. Voltage gated ion channels
   -specific charge
   -diffusion
3. Na+/K+ Pump
   -always active
   -ATP and active transport