Forces Acting Across Membranes 3 Flashcards Preview

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Flashcards in Forces Acting Across Membranes 3 Deck (19)
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1
Q

Define osmosis.

A

The net movement of water from regions of high concentrations to low. It dictates fluid balance in the body and is necessary for the body to function

2
Q

Water concentration is the _____ of solute concentration.

A

Inverse

3
Q

How does water affect concentrations in the cell?

A

Water can diffuse through the selectively permeable membrane until the concentration of solute is equal on both sides of the membrane by diluting the more concentrated side.

4
Q

Define osmotic pressure.

A

Pressure that must be applied to oppose osmosis

5
Q

What defines osmotic effect on water concentration?

A

Solute particles.

6
Q

Define osmolarity.

A

Defines the concentration of biological solutions in units of osmoles.

7
Q

What is normal human plasma osmolarity?

A

285/300 mOsmol/l

8
Q

What acts as non-penetrating molecules in ECF?

A

Sodium and chlorine.

9
Q

What acts as non-penetrating molecules in ICF?

A

Potassium and organic anions.

10
Q

Define tonicity.

A

Describes the number of non-penetrating particles in solution.

11
Q

Define isomotic.

A

Solution has the same total number of solute particles as ECF.

12
Q

Define hyperosmotic.

A

Solution has more solute particles than ECF.

13
Q

Define hypoosmotic.

A

Solution has less solute particles than ECF.

14
Q

Define isotonic.

A

Solution has the same number of non-penetrating solute particles as ECF.

15
Q

Define hypertonic.

A

Solution has more non-penetrating solute particles than ECF.

16
Q

Define hypotonic.

A

Solution has less non-penetrating solute particles than ECF.

17
Q

What happens to a cell placed in an isotonic solution?

A

Nothing.

18
Q

What happens to a cell placed in a hypertonic solution?

A

Cell will shrink

19
Q

What happens to a cell placed in a hypotonic solution?

A

Cell will swell and burst.