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प्रश्न
Explain the autoregulatory mechanism of GFR.
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उत्तर
- The mechanism by which the kidney regulates the glomerular filtration rate is autoregulative. It is carried out by the juxtaglomerular apparatus.
- The juxtaglomerular apparatus is a microscopic structure located between the vascular pole of the renal corpuscle and the returning distal convoluted tubule of the same nephron.
- It plays a role in regulating the renal blood flow and glomerular filtration rate. When there is a fall in the glomerular filtration rate, it activates the juxtaglomerular cells to release renin.
- This stimulates the glomerular blood flow, thereby bringing the GFR back to normal. Renin brings the GFR back to normal by the activation of the renin-angiotensin mechanism.
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संबंधित प्रश्न
Glucose is taken back from glomerular filtrate ___________
(A) along with concentration gradient
(B) against concentration gradient
(C) by simple diffusion
(D) by tubular secretion
Explain the process of formation of urine with suitable diagram
Answer the following in detail.
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Give the working of the nephron.
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Sometimes urine may contain certain excess vitamins.
Multiple Choice Question: Ultrafiltration occurs in:
Multiple Choice Question: In the Bowman’s capsule:
Answer the following question.
Effective filtration pressure was calculated to be 20 mmHg; where glomerular hydrostatic pressure was 70 mm of Hg. Which other pressure is affecting the filtration process? How much is it?
In which segment of the nephron most of the re-absorption of substances takes place?
When a molecule or ion is reabsorbed from the lumen of the nephron, where does it go? If a solute is filtered and not reabsorbed from the tubule, where does it go?
If Henle’s loop were absent from mammalian nephron, which one of the following is to be expected?
The end product of Ornithine cycle is ______.
Identify the biological term
Regulation of water and dissolved substances in blood and tissue fluid.
The human kidney is histologically divided into ____________.
Proximal convoluted tubule differs from distal convoluted tubule being lined by ______
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Complete the following:
Urinary excretion = Tubular reabsorption + Tubular secretion –
How does tubular secretion help in maintaining ionic and acid-base balance in body fluids?
Name the substances other than water, that are reabsorbed during urine formation. What are the two parameters that decide the amount of water that is reabsorbed in the kidney?
Name the following:
Three stages of urine formation.
