Wk 3

Question 1

What is simple diffusion

Answer 1

molecule passes through phospholipid bilayer

Question 2

What is facilitated diffusion channel

Answer 2

there is a channel in the phospholipid bilayer allowing the molecule to cross

Question 3

What id Facilitated diffusion carrier

Answer 3

the molecule is attached to a carrier molecule to pass through the channel

Question 4

What is the equilibrium potential

Answer 4

Electrical and chemical forces are equal

Question 5

What is the difference in electrical charge between the inside and outside of the cell

Answer 5

-70mV

Question 6

What 3 ions have a higher concentration gradient inside the cell

Answer 6

Na+, Ca2+, Cl-

Question 7

What 2 ions have a higher concentration gradient outside the cell

Answer 7

K+ and OA-

Question 8

What 3 ions have a higher electrical gradient inside the cell

Answer 8

Na+, Ca2+, K+ (all of the positively charged ones)

Question 9

What 2 ions have a higher electrical gradient outside the cell

Answer 9

Cl-, OA- (all of the negatively charged ones)

Question 10

Is the inside of the cell positive or negative

Answer 10

Negative

Question 11

Where do positively charged ions want to travel

Answer 11

Inside the cell

Question 12

Where do negatively charged ions want to travel

Answer 12

outside the cell

Question 13

What ions have their own channel to pass through the membrane

Answer 13

Na+, K+, Ca2+, Cl-

Question 14

What 2 ions have concentration and electrical gradients that oppose each other

Answer 14

K+ and Cl-

Question 15

Where does Cl- and K+ start

Answer 15

inside the cell

Question 16

How does Cl- leave the cell when its electrical and chemical gradients oppose each other

Answer 16

K+ symporter

Question 17

What is a symporter

Answer 17

Where ion ‘A’ moves with its concentration gradient, creating energy for ion ‘B’ to travel against its concentration gradient

Question 18

How does Ca2+ leave the cell

Answer 18

Na+ Ca2+ antiporter

Question 19

What is an anti porter

Answer 19

Exchanges 2 different ions (allowing for some to leave and others to enter)

Na+ Ca2+ antiporter uses 3 Na+ into the cell, 1 Ca2+ out of the cell

Question 20

In the sodium potassium pump, how many mol flow in and out of the cell

Answer 20

2 K+ move into the cell, 3 Na+ move out of the cell

Question 21

What is the equilibrium potential

Answer 21

The point at where the concentration gradient (forcing K outside the cell) and the electrical gradient (forcing K inside the cell) is -70mV