Chap 4 (osmosis) Flashcards Preview

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Flashcards in Chap 4 (osmosis) Deck (10):
1

Flow of water across a membrane is always what?

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

2

What is osmosis?

The flow of water across a membrane down its concentration gradient

3

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

Concentration gradient

4

What is osmolarity?

Total solute particle concentration of a solution.

5

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

iso-osmotic, hyperosmotic, hypo-osmotic

6

Osmolarity can be interchanged with

osmotic pressure

7

Osmotic pressure is proportional to what?

concentration of the solute

8

What is tonicity?

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

9

What does isotonic mean?

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

10

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

Hypertonic, hypotonic