Chap 4 (osmosis)

Question 1

Flow of water across a membrane is always what?

Answer 1

Passive, unaffected by membrane potentials and is always driven by its own concentration gradient

Question 2

What is osmosis?

Answer 2

The flow of water across a membrane down its concentration gradient

Question 3

Direction of passive water flow into or out of cell depends on what?

Answer 3

Concentration gradient

Question 4

What is osmolarity?

Answer 4

Total solute particle concentration of a solution.

Question 5

Two solution have the same osmolarity. One higher than the other, one lower.

Answer 5

iso-osmotic, hyperosmotic, hypo-osmotic

Question 6

Osmolarity can be interchanged with

Answer 6

osmotic pressure

Question 7

Osmotic pressure is proportional to what?

Answer 7

concentration of the solute

Question 8

What is tonicity?

Answer 8

function of concentration of nonpermeating solutes outside a cell relative to the concentration inside the cell.

Question 9

What does isotonic mean?

Answer 9

when it does not alter cell volume neither shrinks nor swells.

Question 10

What is a solution that causes cells to shrink? Causes to swell?

Answer 10

Hypertonic, hypotonic