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Read the following statements about urine formation :

i. ultrafiltration doesn’t need any energy expenditure by kidney cells.
ii. selective reabsorption of glucose, water, urea, hormones, amino acids etc takes place through passive transport.
iii. PCT cells have many microvilli along with few mitochondria since most of nutrients are absorbed passively.
  • a)
    only statement ii) and iii) are correct.
  • b)
    only statement ii) is correct.
  • c)
    only statement i) is correct.
  • d)
    all statements are correct.
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
Read the following statements about urine formation :i. ultrafiltratio...
During urine formation, ultra filtration takes place in which energy is not required by cells of kidney. Selective reabsorption of glucose , water, salt etc. occurs actively and proximal convoluted tubules (PCT) do not have microvilli.
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Most Upvoted Answer
Read the following statements about urine formation :i. ultrafiltratio...
Urine Formation

Statement i: Ultrafiltration doesn't need any energy expenditure by kidney cells.

Ultrafiltration is the initial step in urine formation, which occurs in the glomerulus of the nephron. The glomerulus is a network of capillaries with a high pressure that forces the fluid part of the blood, along with small molecules, to enter the Bowman's capsule. This process is driven by hydrostatic pressure and does not require any energy expenditure by the kidney cells. Therefore, statement i is correct.

Statement ii: Selective reabsorption of glucose, water, urea, hormones, amino acids, etc., takes place through passive transport.

After ultrafiltration, the filtrate enters the proximal convoluted tubule (PCT), where selective reabsorption occurs. Selective reabsorption is the process of reclaiming essential molecules and ions from the filtrate and returning them to the bloodstream. This process involves both active and passive transport mechanisms.

While it is true that some substances, such as water and urea, are reabsorbed through passive transport, other important substances like glucose and amino acids are actively transported back into the bloodstream. Active transport requires energy expenditure by the kidney cells. Therefore, statement ii is incorrect.

Statement iii: PCT cells have many microvilli along with few mitochondria since most of the nutrients are absorbed passively.

The PCT is lined with cells that have numerous microvilli on their surface. These microvilli increase the surface area available for reabsorption. The PCT is responsible for reabsorbing the majority of the filtered substances, including glucose, amino acids, and ions. However, the reabsorption process is not entirely passive.

Since active transport is involved in the reabsorption of several substances, including glucose and amino acids, the PCT cells require a significant amount of energy. Mitochondria are the powerhouses of the cell, responsible for generating energy in the form of ATP. Therefore, PCT cells have a high number of mitochondria to meet the energy demands of active transport. Consequently, statement iii is incorrect.

Conclusion: Only statement i is correct.
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Read the following statements about urine formation :i. ultrafiltration doesn’t need any energy expenditure by kidney cells.ii. selective reabsorption of glucose, water, urea, hormones, amino acids etc takes place through passive transport.iii. PCT cells have many microvilli along with few mitochondria since most of nutrients are absorbed passively.a)only statement ii) and iii) are correct.b)only statement ii) is correct.c)only statement i) is correct.d)all statements are correct.Correct answer is option 'C'. Can you explain this answer?
Question Description
Read the following statements about urine formation :i. ultrafiltration doesn’t need any energy expenditure by kidney cells.ii. selective reabsorption of glucose, water, urea, hormones, amino acids etc takes place through passive transport.iii. PCT cells have many microvilli along with few mitochondria since most of nutrients are absorbed passively.a)only statement ii) and iii) are correct.b)only statement ii) is correct.c)only statement i) is correct.d)all statements are correct.Correct answer is option 'C'. Can you explain this answer? for NEET 2024 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about Read the following statements about urine formation :i. ultrafiltration doesn’t need any energy expenditure by kidney cells.ii. selective reabsorption of glucose, water, urea, hormones, amino acids etc takes place through passive transport.iii. PCT cells have many microvilli along with few mitochondria since most of nutrients are absorbed passively.a)only statement ii) and iii) are correct.b)only statement ii) is correct.c)only statement i) is correct.d)all statements are correct.Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for NEET 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Read the following statements about urine formation :i. ultrafiltration doesn’t need any energy expenditure by kidney cells.ii. selective reabsorption of glucose, water, urea, hormones, amino acids etc takes place through passive transport.iii. PCT cells have many microvilli along with few mitochondria since most of nutrients are absorbed passively.a)only statement ii) and iii) are correct.b)only statement ii) is correct.c)only statement i) is correct.d)all statements are correct.Correct answer is option 'C'. Can you explain this answer?.
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