Neuro 2

Question 1

What is the equilibrium potential for Na ?

Answer 1

+60

Question 2

The cell is _____ more times permeable to potassium than sodium

Answer 2

25

Question 3

Na/K pumps counteract:

Answer 3

Leakage flow

Question 4

Which direction do the electrical and chemical forces work on Na+

Answer 4

Chemical IN

ELECTRICAL IN

Question 5

True/false

The net force of Na is stronger than K

Answer 5

True

But membrane permeability favours K

Question 6

Gated channels open or close in response to ______ and affect movement of _______

Answer 6

Stimuli

Ions

Question 7

3 types of gated channels

Answer 7

Voltage
Ligand (chemical)
Mechanical

Question 8

Grades potentials

Answer 8

Small

Communicate over short distances

Question 9

Action potentials

Answer 9

Large

Communicate over long distances

Question 10

Graded potentials are initiated by a ________ and cause a small change in _____________

Answer 10

Stimulus

Membrane potential

• also magnitude varies

Question 11

Can graded potentials hyper polarize as well as depolarize?

Answer 11

Yes

Question 12

What determines whether an action potential will occur?

Answer 12

Graded potentials

Question 13

Define threshold of a graded potential

Answer 13

The level of depolarization necessary to elicit an action potential

Question 14

If something is excitatory what does it do to the cell voltage

Answer 14

Depolarizers

Question 15

If something is inhibitory what will it do to cell voltage

Answer 15

Hyper polarize

Question 16

How do graded potentials spread?

Answer 16

By ELECTROTONIC conduction

Question 17

Can graded potential lose strength of the potential?

Answer 17

Yes. It is decrement all

Magnitude decays as it spreads

Question 18

Temporal summation

Answer 18

Same stimulus

Repeated close together in time

Question 19

Spatial summation

Answer 19

Different stimuli

Overlap in time