Home
Class 12
BIOLOGY
Statement (A): Humans have the ability t...

Statement (A): Humans have the ability to produce concentrated urine.
Statement (B) : Majority of the nephrons in the human kidney have very long loops of Henle and well-developed vasa recta which are involved in countercurrent mechanism.

A

Both A and B are correct

B

Both A and B are false

C

A is true, but B is false

D

A is false, but B is true

Text Solution

AI Generated Solution

The correct Answer is:
To analyze the statements provided in the question, we will break down each statement and evaluate their correctness step by step. ### Step 1: Evaluate Statement A **Statement A:** "Humans have the ability to produce concentrated urine." - Humans possess a specialized structure in their kidneys called nephrons, which are responsible for filtering blood and forming urine. - The ability to produce concentrated urine is primarily due to the presence of a long loop of Henle in the nephron. - The longer the loop of Henle, the greater the ability to concentrate urine, as it allows for more reabsorption of water and solutes. - Therefore, Statement A is **correct**. ### Step 2: Evaluate Statement B **Statement B:** "Majority of the nephrons in the human kidney have very long loops of Henle and well-developed vasa recta which are involved in the countercurrent mechanism." - There are two types of nephrons in the human kidney: cortical nephrons and juxtamedullary nephrons. - Juxtamedullary nephrons, which have long loops of Henle and well-developed vasa recta, are primarily responsible for the concentration of urine. - The countercurrent mechanism refers to the flow of fluid in opposite directions in the loop of Henle and the vasa recta, which helps maintain a concentration gradient necessary for water reabsorption. - However, it is important to note that not all nephrons have long loops of Henle; the majority are cortical nephrons, which have shorter loops. - Therefore, Statement B is **partially correct**, but it implies that the majority of nephrons contribute to the ability to concentrate urine, which is misleading. ### Conclusion - Statement A is correct. - Statement B is misleading as it suggests that the majority of nephrons have long loops of Henle, which is not the case. ### Final Answer - Statement A is correct. - Statement B is misleading.
Promotional Banner

Topper's Solved these Questions

  • EXCRETORY PRODUCTS AND THEIR ELIMINATION

    AAKASH SERIES|Exercise EXERCISE - I (REGULATION OF KIDNEY FUNCTION)|11 Videos

  • EXCRETORY PRODUCTS AND THEIR ELIMINATION

    AAKASH SERIES|Exercise EXERCISE - I (MICTURITION)|4 Videos

  • EXCRETORY PRODUCTS AND THEIR ELIMINATION

    AAKASH SERIES|Exercise EXERCISE - I (FUNCTION OF THE TUBULES)|18 Videos

  • EVOLUTION

    AAKASH SERIES|Exercise EXERCISE - III( PREVIOUS AIPMT/NEET QUESTIONS)|38 Videos

  • HUMAN REPRODUCTION

    AAKASH SERIES|Exercise EXERCISE-III|55 Videos

Similar Questions

Explore conceptually related problems

Assertion :- Mammals have the ability to produce a concentrated urine. Reason :- Counter current mechanism occurs in vasa recta and Henle's loop.

Which of the following statements is not correct for most common type of nephrons of human kidney ?

Assertion: The Henle's loop and vasa recta play a significant role in producing a concentrated urine. Reason: The counter current arrangement of Henle's loop and vasa recta helps in this.

Read the statements given below A. The renal cortex extends between the medullary pyramids as Columns of Bertini. B. ATP molecules are used in kidneys to convert NH3 to urea. C. Reabsorption of water in PCT and loop of Henle is obligatory. D. High medullary osmolarity is mainly developed due to NaCI and urea by counter current mechanism of vasa recta and loop of Henle. The correct statements are

Read the following statements about the excretory system in humans: I. A fall in GFR can activate the JG cells to release renin. II. ADH can also affect the kidney function by its constrictory effects on blood vessels. III. The proximity between the Henle's loop and vasa recta, as well as the counter-current in them help in maintaining an increasing osmolarity towards the outer medullary interstitium. IV Our lungs remove large amounts of CO_(2) (108 litres/day). V. Renal calculi are the stone or insoluble mass of crystallised salts like oxalates within the kidney. How many of these are correct?

Statement-1 : Mechanical transverse waves cannot be generated in gaseous medium Statement-2 : Mechanical transverse waves can be produced only in such medium which have shearing property.

Statement-A: The mosses have an elaborate mechanism of spore dispersal. Statement-B: Leafy stage in mosses develops from secondary protonema as an apical bud.

Go through the following statements. (i) Liver is the site of urine formation. (ii) Urethra is not the part of kidney. (iii) Vasa recta is well developed in cortical nephrons. (v) The highest concentration of urea is found in Hepatic vein. (vi) Least concentration of urea is present in renal vein. How many statements are correct? (a) 0 (b) 2 (c) 3 (d) 5

Read the following statements (A - D) : 1. Catecholamines secreted from adrenal medulla stimulate breakdown of glycogen resulting in an increased concentration of glucose in blood. 2. Cortisol is also involved in maintaining the cardio -vascular syem as well as kidney functions. 3. Hormone released from zona fasciculate produce anti-inflammatroy reactions and suppresses the immune response. 4. Androgenic steroids secreted by adrenal cortex play a role in growth of axial hair, pubic hair and facial hair during puberty. How many of the above statements are ture?

which of the following statements about human kidneys are incorrect? I. The cortex extends in between the medullary pyramids as renal columns called Columns of Bertini. II. Inside the kidney, there are two zones, an outer cortex and an inner medulla. III. Towards the centre of the inner convex surface of the kidney is a notch called hilum through which ureter, blood vessels and nerves enter. IV. Human kidneys extend from the 12^(th) thoracic vertebra to the 5^(th) lumbar vertebra. (a) I and III (b) II and IV (c) III and IV (d) I and II