21. Diuresis is the condition in which

A The excretion of volume of urine increases
B The excretion of volume of urine decreases
C The kidney fails to excrete urine
D The water balance of the body is disturbed.
Answer :   The excretion of volume of urine increases
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22. A fall in glomerular filtration rate (GFR) activates

A adrenal cortex to release aldosterone
B adrenal medulla to release adrenaline
C juxta - glomerular cells to release renin
D posterior pituitary to release vasopressin
Answer :   juxta - glomerular cells to release renin
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23. Absorption Na+ and K+ ions does not occur in

A Bowman's capsule
B Loop of henle
C Distal convoluted tubule
D Proximal convoluted tubule
Answer :   Bowman's capsule
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24. Presence of which of the following conditions in urine are indicative of Diabetes Mellitus?

A Uremia and Renal Calculi
B Ketonuria and Glycosuria
C Renal calculi and Hyperglycaemia
D Uremia and Ketonuria
Answer :   Ketonuria and Glycosuria
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25. Diameter of the renal afferent vessel is

A Same as that of efferent
B Smaller than that of efferent
C Larger than that of efferent
D There is no efferent vessel
Answer :   Larger than that of efferent
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26. Sulphates phosphates and carbonates of calcium are excreted by

A Kidney
B Liver
C Spleen
D Colon
Answer :   Colon
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27. Which of the following does not favour the formation of large quantities of dilute urine?

A Caffeine
B Renin
C Atrial-natriuretic factor
D Alcohol
Answer :   Renin
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28. Formation of concentrated (hyperosmotic) urine in vertebrates generally depends on

A length of the proximal convoluted tubule
B length of Henle's loop
C area of Bowman's capsule epithelium
D capillary network forming glomerulus
Answer :   length of Henle's loop
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29. Ornithine cycle performs

A ATP synthesis
B Urea formation in spleen
C Urea formation in liver
D Urine formation in liver
Answer :   Urea formation in liver
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30. (A) The conversion of a protein waste, the ammonia into urea, occurs in (B) Urea is synthesized in

A Kidneys
B Lungs
C Intestine
D Liver
Answer :   Liver
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