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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.'
Which of the following describes the level of organization in Phylum Mollusca?
According to the NCERT text, 'Molluscs are terrestrial or aquatic (marine or fresh water) having an organ-system level of organisation.' This indicates that Phylum Mollusca exhibits an organ-system level of organization.
Identify the characteristic of Phylum Mollusca among the following options.
The NCERT text states, 'The molluscs have a soft body surrounded by an external calcareous shell.' and further, 'Body is covered by a calcareous shell and is unsegmented with a distinct head, muscular foot and visceral hump.' This clearly indicates the presence of a calcareous shell and unsegmented body as characteristics of Mollusca.
The second largest animal phylum is:
The NCERT text explicitly states, 'This is the second largest animal phylum (Figure 4.13).' in reference to Phylum Mollusca.
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The bank mixes NEET previous year questions (PYQs) with practice questions, each tagged with its exam appearances where applicable.