Q10 / 157 · NTA Abhyas (NEET) 2020 · Zoology · Excretory Products and their Elimination

Identify the CORRECT statement regarding urine formation.

  • A
    Countercurrent mechanism works around the PCT and glomerulus.
  • Correct answer
    B
    To prevent diuresis, ADH facilitates water reabsorption from the latter parts of the tubule.
  • C
    Maximum reabsorption of electrolytes occurs in the Henle's loop.
  • D
    A decrease in blood pressure can increase the GFR.

Solution

Nephron is the structural and functional unit of kidney. Each nephron consists of glomerulus and the renal tubule. Renal tubule consists of Bowman's capsule and PCT, DCT and Henle's loop. Urine formation takes place through Nephron. It includes three steps: Ultrafiltration, Tubular Reabsorption and Tubular secretion. Maximum reabsorption takes place through PCT (Proximal Convulated Tubules). GFR IS Glomerular filtration rate that is directly related to the blood pressure. Counter current mechanism works to form concentrated urine so that maximum amount of water is retained in the body. This is done by Henle's loop and vasa recta as these two are parallel to each other and the flow of substances is in counter mechanism. To prevent water loss, one more hormone called as ADH (Anti Diuretic Hormone) released from pituitary acts on distal parts of tubules. It prevents water loss by increasing water reabsorption.

Hence, the correct answer is option: 'B'.

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