Ohm's Law (FINAL)

Question 1

Give the formula for Ohm’s Law.

Answer 1

V=IR or I=V/R=gV

Question 2

Explain variables V, I, R, and g.

Answer 2

V = potential difference in volts
I = current in amperes
R = resistance
g = 1/R, which is capacitance, measured in Siemens

Question 3

How do ion channels behave?

NOTE: Think in terms of circuit/electrical structures

Answer 3

Like conductors or resistors

Question 4

What happens when permeant ions asymmetrically distribute across the plasma membrane?

Answer 4

The resulting gradient pushes them through an open channel

Question 5

What is the conductance value when an ion channel is closed?

Answer 5

Zero

Question 6

How does the cell membrane behave in response to ionic flow?

Answer 6

It acts as an ion flow barrier

Question 7

How is the cell membrane’s resistance to ion flow determined?

Answer 7

Number/type of channels and pores present across membrane

Question 8

What does Ohm’s law simply state?

Answer 8

Current flow (I) through a resistor with resistance R in Ohms