NEET Biology NEET PYQ-Excretory System In Animals

  • question_answer
    A fall in glomerular, filtration rate (GFR) activates [AIPMT (M) 2012]

    A) juxta glomerular cells to release renin

    B) adrenal cortex to release aldosterone

    C) adrenal medulla to release adrenaline

    D) posterior pituitary to release vasopressin

    Correct Answer: A

    Solution :

    [A] Juxtaglomerular apparatus consists of macula densa and Juxtaglomerular cells. The apparatus becomes active when there is decrease in renal blood pressure or decrease in glomerular filtration rate. There is increased absorption of NaCI in ascending limb or loop of Henle. The- decreased NaCI content of filtrate activates - cells of macula densa to increase secretion of renin from juxta glomerular cells. Renin convert angiotensinogen to angiotensin peptides.

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