Tissues 5

Question 1

How much of a person is water?

Answer 1

60%

Question 2

How much of the water content is intracellular?

Answer 2

55%

Question 3

How much of the water content is extracellular?

Answer 3

45%

Question 4

Describe the composition of body water.

Answer 4

Interstitial fluid - 36%
Blood plasma - 7%
Transcellular fluid - 2% (eg CSF)

Question 5

Where is more Na found?

Answer 5

Extracellularly

Question 6

Where is more K found?

Answer 6

Intracellularly

Question 7

Where is more Ca found?

Answer 7

Extracellularly

Question 8

Where is more Cl found?

Answer 8

Extracellularly

Question 9

Whats the difference between plasma and interstitial fluid?

Answer 9

Plasma has more protein

Question 10

Where are more protein anions found?

Answer 10

Intracellularly

Question 11

Why is intracellular pH lower?

Answer 11

H+ conc is greater there.

Question 12

Osmolarity of all cells is same outside as inside. Why?

Answer 12

To prevent osmotic damage

Question 13

What is osmolarity?

Answer 13

Measure of all solute particles in a solution

Question 14

Why isn’t osmolarity a good guide of the effects of cell volume?

Answer 14

Doesn’t depend on cell permeability

Question 15

What is tonicity?

Answer 15

Defines strength of a solution as it affects final cell volume

Depends on both membrane permeability and solution composition

Question 16

Hypertonic?

Answer 16

Outside impermeant solutes greater than intracellular solutes.

Cell shrinks

Question 17

Hypotonic?

Answer 17

Intracellular impermeant solutes greater than extracellular

Cell swells

Question 18

Isotonic?

Answer 18

Osmolarity of impermeant solutes equal either side of the membrane.

Cell remains the same

Question 19

In reality, why do cells not burst?

Answer 19

Presence of Na/K pump on all cell membranes.

Maintains Na conc lower inside the cell than outside

Question 20

When tissue fluid is released, where do lipid soluble molecules diffuse out of?

Answer 20

The endothelium of the capillaries.

Question 21

What do pores in the capillary wall allow?

Answer 21

Exchange of water and water soluble molecules.

Question 22

Name 3 causes of oedema

Answer 22

Inflammation, trauma, hypertension