The volume of glomerular filtrate is 18l but the volume of the urine excreted is 1-2l. give a suitable reason for this statement.
Answers
Answer:
- This is so that the body doesn't lose water, nutrients, or ions. Selective tubular reabsorption occurs following glomerular filtration, and as much as 99 percent of the material in the filtrate is reabsorbed as a result.
- Because of tubular reabsorption, urine primarily contains waste and extra water.
- A third method of urine generation known as tubular secretion removes some blood molecules that are not eliminated by filtration from the glomerular capillaries.
- These two procedures reduce the enormous amount of glomerular filtrate to around 1.5 liters of urine output.
- The ultrafiltration of the plasma and its contents in the glomerulus is referred to as glomerular filtration (GFR). It is controlled by two main variables. 1. The filtering efficiency (kf) 2. Starling force or the pressure gradient (hydrostatic and osmotic pressure gradient).
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Answer:
The volume of the glomerular filtrate is 18L but only 1-2L volume is excreted in the urine. The reason behind this is the reabsorption by renal tubules (that includes different parts such as Henle’s loop, ascending, and descending loop). Reabsorption is done to reabsorb the needed material, which is required by the body. The substances are reabsorbed by either active or passive mechanisms. The substances like amino acids, sodium ions, and glucose are absorbed actively and nitrogenous substances are reabsorbed by the passive transport mechanism. These materials are reabsorbed and enter the bloodstream. Water is reabsorbed to maintain the water level in the body. As a consequence of tubular reabsorption, urine contains mostly waste material and excess water. Hence, the volume reduces to 1-2L from 18L as it passes through the renal tubule.
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