Body Fluid and Compartments

Question 1

What percentage of the body is aqeuous fluid?

Answer 1

~60%

Question 2

In percentages, what is the distribution of fluid in the body?

Answer 2

1- Total body water: 60%
2- Intracellular fluid: 40%
3- Extracellular fluid: 20%
4- Interstitial fluid: 15% (75% of ECF)
5- Blood plasma: 5% (25% of ECF)

Question 3

In percentages, what is the cell membrane composition?

Answer 3

1- 55% protein
2- 25% phospholipids
3- 13% cholesterol
4- 4% other lipids
5- 3% carbohydrates

Question 4

What are spingolipids?

Answer 4

1- Lipids
2- Component of cell membrane, especially nerve cells
3- Contain amino alcohols
4- Hydrophilic-hydrophobic characters

Question 5

What are the two types of diffusion?

Answer 5

1- Passive diffusion

2- Facilitated diffusion

Question 6

What substances pass through the membrane via facilitated diffusion and how?

Answer 6

1- Hydrophilic substances

2- Via integral membrane protein pores or carriers

Question 7

What factors affect net diffusion rate?

Answer 7

1- Concentration
2- Electrical potential
3- Pressure

Question 8

How is membrane permeability calculated?

Answer 8

P = ωRT k/a
1- P = membrane permeability constant
2- R = gas constant
3- T = absolute temperature
4- k= molecule resistance
5- a = thickness of membrane