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Standard X
Biology
Micturition
Which is true...
Question

Which is true for excretion in humans

A
Glucose and amino acids are reabsorbed in PCT by simple diffusion
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B
DCT is impermeable to water
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C
On the average, 25-30 gm of urea is excreted per day
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D
Maximum reabsorption occurs in loop of Henle
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Solution

The correct option is C On the average, 25-30 gm of urea is excreted per day
The composition of urine in humans is 95% water, 2.5 % urea and 2.5% other waste. As urea is the major excretory waste humans are considered ureotelic, on an average, 25-30 g of urea is excreted out per day.
So, the correct answer is 'On the average, 35-30 gm of urea is excreted per day'.

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Q. Select the statements which are correct with respect to loop of Henle in a nephron.
1) Ascending limb of loop of Henle is impermeable to electrolytes, but is permeable to water.
2) Descending limb of loop of Henle is permeable to water but is impermeable to electrolytes
3) Both ascending and descending limbs are permeable to water.
4) Reabsorption is minimum in the ascending limb of loop of Henle.
Q. Consider the following four statements (i-iv) and select the option that correctly identifies the true (T) and false (F) ones.
(i) Atrial natriuretic factor can cause vasodilation( dilation of blood vessels) and thereby decreases the blood pressure.
(ii) On an average, 60−70 gm of urea is excreted out per day.
(iii) Sebaceous glands eliminate certain substances like NaCl , urea and lactic acid through sebum.
(iv) PCT is lined by simple cuboidal brush border epithelium which increases the surface area for reabsorption.
Q. Assertion :The renal fluid becomes increasingly concentrated when it flows down in the descending limb of Loop of Henle towards the inner medulla but its concentration decreases in the ascending limb when it flows towards the cortex. Reason: The descending limb of the loop of Henle reabsorbs water, the ascending limb is impermeable to water but salts are reabsorbed.
Q.

Animals which excrete urea produced during metabolism of amino acids are


Q.

Fill in the gaps:

(a) Ascending limb of Henle’s loop is ____________to water whereas the descending limb is___________to it.

(b) Reabsorption of water from distal parts of the tubules is facilitated by hormone____________.

(c) Dialysis fluid contains all the constituents as in plasma except ________.

(d) A healthy adult human excretes (on an average) _______ gm of urea/day.

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