Practice free Excretory Products and Their Elimination (Zoology) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
What percentage of the glomerular filtrate is reabsorbed by the renal tubules daily?
The passage highlights: 'A comparison of the volume of the filtrate formed per day (180 litres per day) with that of the urine released (1.5 litres), suggest that nearly 99 per cent of the filtrate has to be reabsorbed by the renal tubules.'
Which segment of the nephron is primarily responsible for the reabsorption of nearly all essential nutrients, and 70-80 percent of electrolytes and water?
The text states: 'Proximal Convoluted Tubule (PCT): PCT is lined by simple cuboidal brush border epithelium which increases the surface area for reabsorption. Nearly all of the essential nutrients, and 70-80 per cent of electrolytes and water are reabsorbed by this segment.'
Tubular secretion is an important step in urine formation because it primarily helps in:
The context mentions: 'Tubular secretion is also an important step in urine formation as it helps in the maintenance of ionic and acid base balance of body fluids.'.
Which of the following substances are secreted into the filtrate by tubular cells to maintain pH and ionic balance?
The text states: 'During urine formation, the tubular cells secrete substances like H+, K+ and ammonia into the filtrate. Tubular secretion is also an important step in urine formation as it helps in the maintenance of ionic and acid base balance of body fluids.'
The collecting duct contributes to the maintenance of pH and ionic balance of blood by the selective secretion of:
According to the context: 'Collecting Duct: ...It also plays a role in the maintenance of pH and ionic balance of blood by the selective secretion of H+ and K+ ions (Figure 16.5).'
Which statement about the reabsorption of water and nitrogenous wastes is correct?
The text clearly states: 'Reabsorption of water also occurs passively in the initial segments of the nephron (Figure 16.5)' and '...whereas the nitrogenous wastes are absorbed by passive transport.'
What is the primary role of the PCT's brush border epithelium?
The context explains: 'Proximal Convoluted Tubule (PCT): PCT is lined by simple cuboidal brush border epithelium which increases the surface area for reabsorption.'
Small amounts of urea are allowed to pass into the medullary interstitium by the collecting duct to:
The text mentions: 'Collecting Duct: ...This segment allows passage of small amounts of urea into the medullary interstitium to keep up the osmolarity.'
The three main processes involved in urine formation are:
The summary explicitly states: 'Urine formation involves three main processes, i.e., filtration, reabsorption and secretion.'
Besides kidneys, which of the following organs also assist in the elimination of excretory wastes?
As per NCERT text, 'Other than the kidneys, lungs, liver and skin also help in the elimination of excretory wastes.'
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