Composition of body fluids
1 Water comprises what percentage of body weight in women ?
A. ~ 50 %
B. ~ 60 %
C. ~ 70 %
D. ~ 80 %
2 Water comprises what percentage of body weight in men ?
A. ~ 50 %
B. ~ 60 %
C. ~ 70 %
D. ~ 80 %
3 What percentage of total body water is found as intracellular fluid (ICF) ?
A. 15 - 35 %
B. 35 - 55 %
C. 55 - 75 %
D. 75 - 95 %
4 What percentage of total body water is found as extracellular fluid (ECF) ?
A. 15 - 25 %
B. 25 - 45 %
C. 45 - 55 %
D. 55 - 75 %
5 Ratio of water in intravascular and extravascular spaces is ?
A. 1 : 2
B. 2 : 1
C. 1 : 3
D. 3 : 1
6 Which of the following is correct ?
A. ECF osmolality = ICF osmolality
B. ECF osmolality < ICF osmolality
C. ECF osmolality > ICF osmolality
D. Any of the above
7 Which of the following is an ‘osmolyte’ ?
A. Myo-inositol
B. Betaine
C. Creatine
D. All of the above
8 Which of the following is a reflection of ECF volume ?
A. Total body Na+
B. Total body K+
C. Total body Cl-
D. Total body HCO3-
9 A change in ICF osmolality is due to a change in ?
A. ICF water content
B. ICF Na+ content
C. ICF K+ content
D. ICF Cl- content
10 Which of the following is known as “ineffective osmole” ?
A. Inositol
B. Phospholipids
C. Urea
D. All of the above
11 Maximal urine osmolality can be ?
A. 500 mosmol/kg
B. 800 mosmol/kg
C. 1000 mosmol/kg
D. 1200 mosmol/kg
12 Minimum urine osmolality in humans can be ?
A. 50 mosmol/kg
B. 100 mosmol/kg
C. 150 mosmol/kg
D. 200 mosmol/kg
13 Thirst is mediated by ?
A. Increase in effective osmolality
B. Decrease in ECF volume
C. Decrease in blood pressure
D. All of the above
14 ‘Osmoreceptors’ are located in ?
A. Posterior pituitary
B. Anterolateral hypothalamus
C. Posteromedial hypothalamus
D. All of the above
15 Average osmotic threshold for thirst is approximately ?
A. 289 mosmol/kg
B. 291 mosmol/kg
C. 293 mosmol/kg
D. 295 mosmol/kg
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