Pumps and Epithelia

Question 1

Na/K ATPase pumps __ in and ___ out.

Answer 1

K in

Na out

Question 2

Constant pumping by the Na/K ATPase counters _____________________________________. It is required to keep ___________________________.

Answer 2

The leakage of ions across the cell membrane

Normal electrolyte concentrations

Question 3

Na/K ATPase action keeps ionic gradients _______. This maintains _______________.

Answer 3

Constant

Resting membrane potential

Question 4

Na+ is ____ to/from it’s equilibrium potential in cells

Answer 4

Far from

Question 5

K+ is ____ to/from it’s equilibrium potential in cells

Answer 5

Far from

Question 6

Cl- is ____ to/from it’s equilibrium potential in cells

Answer 6

Close to

Question 7

What does paracellular mean?

Answer 7

Transport between cells

Question 8

What does transcellular mean?

Answer 8

Transport through cells

Question 9

Paracellular transport is limited by _______________.

Answer 9

Tight junctions

Question 10

What are tight junctions?

Answer 10

Joints between adjacent cell membranes, they are joint together at “kiss” sites by membrane proteins