Muscle potentials

Question 1

what does the driving force equation refer to

Answer 1

the further the membrane potential is from each iosn nernst potential, the more it wants to flow

Question 2

which ion(s) flow through ACh receptors

Answer 2

sodium and potassium

Question 3

what ion flow would occur if the inside of the cell is more negative

Answer 3

less K+ flowing out and more Na+ flowing in

Question 4

what ion flow occurs if the inside of the cell is more positive

Answer 4

more K+ flowing out and less Na+ flowing in

Question 5

what is the resting muscle potential

Answer 5

-90 mV

Question 6

how does muscle potential correspond to K+ flow

Answer 6

muscle potential closer to K+ nernst potential (more negative) = less and less K+ leaving

muscle potential farther from K+ nernst potential (more positive) = more K+ leaving

Question 7

how does muscle potential correspond to Na+ flow

Answer 7

muscle potential farther from Na+ nernst potential = more Na+ flows into the cell at a higher rate as the inside of the cell gets more negative

Question 8

when can there be 0 current in the cell

Answer 8

when the membrane and nernst potential are the same (no matter the number of channels open)

Question 9

is the difference in membrane and nernst potential proportional to the driving force

Answer 9

yes - the greater the difference in membrane and nernst potential, the greater the driving force

Question 10

what is current flow proportional to in the driving force equation

Answer 10

proportional to the difference in membrane potential and nernst potential for the ion