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Tubular Reabsorption and Secretion

Which of the ...

Question

Which of the following is not true about tubular reabsorption?

Nearly 99 per cent of the filtrate has to be reabsorbed by the renal tubules.

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The tubular epithelial cells in different segments of nephron perform reabsorption either by active or passive mechanisms.

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The nitrogenous wastes are absorbed by passive transport.

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Reabsorption of water also occurs actively in the initial segments of the nephron

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Solution

The correct option is D Reabsorption of water also occurs actively in the initial segments of the nephron
Reabsorption of water occurs by osmosis in the initial segments of the nephron. Therefore water reabsorption is a passive process not an active process.

The filtrate formed is 180 litres per day however the urine formed is 1.5 litres. This is because nearly 99 per cent of the filtrate is reabsorbed by the renal tubules.

The tubular epithelial cells in different segments of nephron perform reabsorption either by active or passive mechanisms.

Active: Glucose, amino acids, $N a^{+}$ , etc
Passive: Nitrogenous wastes, water

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Similar questions

Q. Which of the following statements are correct?

(i) Re-absorption of water occurs passively in the initial segment of nephron.
(ii) Nitrogenous wastes are absorbed by passive transport.
(iii) Conditional re-absorption of

N a^{+}

and water takes place in DCT.
(iv) DCT reabsorbs

H C O_{3}

(v) DCT is capable of selective secretion of

H^{+}

K^{+}

, and

N H_{3}

to maintain

p H

and

N a^{+} - K^{+}

balance in blood.

Sorth the following into actively or passively transported substances during reabsorption of GFR. e.g., glucose, amino acids, nitrogenous wastes, $N a^{+}$ water.

Q. Choose the incorrect statement from the following statements
I) GFR in a healthy individual is approximately 125 ml/hr.
II) During urine formation, the tubular cells secrete substances like

H^{+}

K^{+}

and ammonia into the filtrate.
III) On an average, 1100-1200 ml of blood is filtered by the kidneys per minute.
IV) Substances like glucose, amino acids,

N a^{+}

in the filtrate are reabsorbed by passive transport.

Q. Reabsorption in tubules of nephrons occurs by

Q. The hormone involved in the active water reabsorption in renal tubules

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Tubular Reabsorption and Secretion

Standard XII Biology

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