Consider the following statements: 1. In a healthy adult, initial filtrate volume per day is about 180 L. 2. Only 1-2 L is excreted as urine due to reabsorption in tubules. Which of the statements given above is/are correct?

Correct Option The correct option is Both 1 and 2. Explanation Urine formation involves three main processes: glomerular filtration, reabsorption, and secretion. The kidneys filter a large volume of blood plasma to remove metabolic wastes while retaining essential nutrients and water through selective reabsorption. Statement-wise Analysis - Statement 1 is Correct: The first step in urine formation is the filtration of blood, which is carried out by the glomerulus. The Glomerular Filtration Rate (GFR) in a healthy individual is approximately 125 ml/minute. This amounts to roughly 180 liters per day. - Statement 2 is Correct: Although 180 liters of filtrate are formed daily, the volume of urine actually released is only about 1.5 liters. This significant reduction occurs because nearly 99% of the filtrate is reabsorbed by the renal tubules (Proximal Convoluted Tubule, Loop of Henle, Distal Convoluted Tubule, and Collecting Duct) back into the blood. Key Takeaway Key Takeaway: The kidneys possess a highly efficient reabsorption mechanism, reclaiming approximately 99% of the initial glomerular filtrate (180 L/day), resulting in a final urine output of only 1-1.5 L/day.

Consider the following statements: 1. In a… - NCERT Class 10 Science MCQ

NCERT Class 10 Science — Chapter 1: Life Processes

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Consider the following statements:

In a healthy adult, initial filtrate volume per day is about 180 L.
Only 1-2 L is excreted as urine due to reabsorption in tubules.

Which of the statements given above is/are correct?

NCERT textbook question

From NCERT Science - class 10 · Page 97

Options

ANeither 1 nor 2
BBoth 1 and 2
C2 only
D1 only

Did you get this right?

Solution

Correct Option

The correct option is Both 1 and 2.

Explanation

Urine formation involves three main processes: glomerular filtration, reabsorption, and secretion. The kidneys filter a large volume of blood plasma to remove metabolic wastes while retaining essential nutrients and water through selective reabsorption.

Statement-wise Analysis

Statement 1 is Correct: The first step in urine formation is the filtration of blood, which is carried out by the glomerulus. The Glomerular Filtration Rate (GFR) in a healthy individual is approximately 125 ml/minute. This amounts to roughly 180 liters per day.
Statement 2 is Correct: Although 180 liters of filtrate are formed daily, the volume of urine actually released is only about 1.5 liters. This significant reduction occurs because nearly 99% of the filtrate is reabsorbed by the renal tubules (Proximal Convoluted Tubule, Loop of Henle, Distal Convoluted Tubule, and Collecting Duct) back into the blood.

Key Takeaway

Key Takeaway: The kidneys possess a highly efficient reabsorption mechanism, reclaiming approximately 99% of the initial glomerular filtrate (180 L/day), resulting in a final urine output of only 1-1.5 L/day.

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