Composition of Body fluids

Question 1

Total body water for term infant

Answer 1

75%

Question 2

TBW at 1st year of life

Answer 2

60%

Question 3

TBW adult male

Answer 3

60%

Question 4

TBW adult female

Answer 4

50%

Question 5

ICF %BW

Answer 5

30-40%

Question 6

ECF %BW

Answer 6

20-25%

Question 7

Plasma %BW

Answer 7

5%

Question 8

Interstitial fluid %BW

Answer 8

10-15%

Question 9

Dominant cation and anion in ECF

Answer 9

Na; Cl respectively

Question 10

Most abundant cation and anion in ICF

Answer 10

K; phosphates respectively

Question 11

Normal plasma osmolality

Answer 11

285-295mOsm

Question 12

elevated effective osmolality leads to secretion of

Answer 12

ADH

Question 13

Triggers thirst

a. increase in osmolality
b. decrease in osmolality
c. decrease volume
d. increase volume

Answer 13

A

Question 14

renin is produced by

Answer 14

juxtaglomerular apparatus

Question 15

renin secretion is triggered by

Answer 15

Renin is secreted from juxtaglomerular kidney cells, which sense changes in renal perfusion pressure, via stretch receptors in the vascular walls. The juxtaglomerular cells are also stimulated to release renin by signaling from the macula densa.

Question 16

effect of ANP on sodium excetion

Answer 16

increase; therefore water is also excreted