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41.

Out of 1800 litres of blood circulating through our kidneys in 24 hours amount of plasma fittered out in tubules is:

A.	18 litres	B.	108 litres
C.	120 litres	D.	180 litres

42.

Out of 180 litres of plasma filtered out each day by tubules in our kidneys we form which of these amounts as urine:

A.	0.5 litres	B.	0.75 litres
C.	0.95 litres	D.	1.45 litres

43.

Out of 1800 litres of blood circulating through kidneys per day we filter out 180 litres of plasma and out of this we form only 1.45 litres of urine due to which of these mechanisms:

A.	Selective re-absorption	B.	Secretion by tubules
C.	Both by selective re-absorption and secretion	D.	By something else

44.

Selective re-absorption and secretion process occur in:

A.	Glomerulus	B.	Bowman's capsule
C.	In whole of the tubule beyond neck	D.	In collecting part of tubule

45.

Process of selective reabsorption involves:

A.	Only active transport	B.	Only passive transport
C.	Both (a) & (b)	D.	None of these

46.

Pressure of the blood flowing through peritubular capillaries of tubule is very slow and equal to:

A.	13mm Hg	B.	5mm Hg
C.	10mm Hg	D.	7mm Hg

47.

About which of the following percentages of filtrate is reabsorbed by epithelium of tubule in its proximal part:

A.	30-40%	B.	40-50%
C.	65-80%	D.	80-90%

48.

Thin segment of the ascending limb of uriniferous tubule is:

A.	Permeable to water	B.	Impermeable to water
C.	Semipermeable to water	D.	None of these

49.

Thin segment of the ascending limb uriniferous tubule has which of these qualities:

A.	It is impermeable to water	B.	It is permeable to NaCl
C.	It is partially permeable to urea	D.	All of these properties

50.

Thick portion of ascending limb of uriniferous tubule has:

A.	No permeability to urea	B.	Reduced permeability to NaCl
C.	Both (a) & (b)	D.	None of these