MEDIUM
Earn 100
The counter current mechanism involves the transport of ___________ to maintain the concentration of _________ in medullary interstitium.
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Important Questions on Excretion and Osmoregulation
HARD
Explain the mechanism of the concentration of filtrate by Henle’s loop.
EASY
The diagram given below is that of a structure present in a human kidney. Study the same and answer the questions that follow:
What is the fluid that comes to part ‘2’ called? Name the main nitrogenous waste in it.
MEDIUM
In the given diagram of urine formation, which process occurs in X and Y?
MEDIUM
Describe the Excretory system of man giving the structure of a Nephron.
HARD
Match the following ?
| List I | List II | List III | |||
| (i) | High threshold substances | (a) | Not at all reabsorbed | (p) | Creatinine |
| (ii) | Low threshold substances | (b) | Efficiently reabsorbed | (q) | Glucose |
| (iii) | Athreshold substances | (c) | Reabsorbed in very little amounts | (r) | Urea |
HARD
Explain the mechanism of glomerular filtration in urine formation
EASY
Why formation of urine and its elimination is necessary in humans?
EASY
The Bowman's capsule, a part of the kidney is the site of:
EASY
To maintain a concentration gradient in the medullary interstitium, ______
EASY
Identify the part of the nephron that is impermeable to water
HARD
Match the items given in Column I with those in Column II and select the correct option given below:
| Column – I | Column – II (Part | ||
| Function | Part of Excretory System) | ||
| a. | Ultrafiltration | i. | Henle’s loop |
| b. | Concentration of urine | ii. | Ureter |
| c. | Transport of urine | iii. | Urinary bladder |
| d. | Storage of urine | iv. | Malpighian corpuscle |
| v. | Proximal convoluted tubule |
MEDIUM
The increase in osmolarity from outer to inner medullary interstitium is maintained due to :
(i) Close proximity between Henle's loop and vasa recta
(ii) Counter current mechanism
(iii) Selective secretion of and hydrogen ions in
(iv) Higher blood pressure in glomerular capillaries
EASY
Human urine is usually acidic because ?
HARD
Explain the mechanism of ultrafiltration in urine formation.
MEDIUM
Which of the following does not favor the formation of large quantities of dilute urine?
EASY
Which of the following would help in the prevention of diuresis?
EASY
A decrease in blood pressure/volume will not cause the release of
EASY
The diagram given below is that of a structure present in a human kidney. Study the same and answer the questions that follow:
What is the liquid entering part ‘1’ called? Name two substances present in this liquid that are reabsorbed in the tubule.
MEDIUM
The glomerular filtration rate is NOT affected by
EASY
Which of the following factors is responsible for the formation of concentrated urine?
