Tubular Reabsorption and Secretion

Q. Active transport of substances from the blood into the nephron is called .

1. filtration
2. tubular reabsorption
3. tubular secretion
4. back flow

Q.

What happens in filtration?

Q.

Sodium, water and phosphate reabsorption is maximum in_________

1. loop of Henle

2. PCT

3. DCT

4. collecting tubule

Q. The loop of Henle plays no role in concentration of urine in humans.

1. True
2. False

Q. The transfer of materials from peritubular capillaries to the renal tubular lumen is called

1. Tubular Secretion
2. Tubular reabsorption
3. Glomerular filtration
4. All of the above

Q.

The given diagram represents a nephron and its blood supply. Study the diagram and answer the following questions.

(d) Name the two main stages of urine formation.

Q. During the formtion of urine, which among these processes helps in maintaining ionic and acid base balance in body fluids?

1. Ultrafiltration
2. Reabsorption
3. Secretion
4. None of the above

Q. Choose the substances that are reabsorbed in the nephron.

1. Sucrose
2. Glucose
3. Amino acids
4. NaCl
5. HCl
6. Potassium ions
7. ${{\mathrm{HCO}}_3}^{-}$
8. Phosphate

Q. Which of the following is not true about tubular reabsorption?

1. Nearly 99 per cent of the filtrate has to be reabsorbed by the renal tubules.
2. The tubular epithelial cells in different segments of nephron perform reabsorption either by active or passive mechanisms.
3. The nitrogenous wastes are absorbed by passive transport.
4. Reabsorption of water also occurs actively in the initial segments of the nephron

Q. Sort in the correct order of tubular reabsorption process.

1. $\mathrm{Cytosol}$
2. $\mathrm{Luminal}\mathrm{membrane}$
3. $\mathrm{Interstitial}\mathrm{fluid}$
4. $\mathrm{Capillary}\mathrm{wall}$

Q. Choose the substances that are reabsorbed in the nephron.

1. Sucrose
2. Glucose
3. Amino acids
4. NaCl
5. HCl
6. Potassium ions
7. ${{\mathrm{HCO}}_3}^{-}$
8. Phosphate