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Standard XII

Biology

Negative Feedback Mechanism for RAAS

Which of the ...

Question

Which of the following statement is not correct related to ANF?

Increase in blood pressure and blood volume stimulates release of ANF

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Inhibits the release of renin by JGA

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Inhibits the reabsorption of

N a^{+}

and water

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Decrease the urinary excretion

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Solution

The correct option is D Decrease the urinary excretion
An increase in blood volume and blood flow to the atria of the heart can cause the release of peptide hormone called atrial natriuretic factor (ANF). The primary function of ANF is to decrease blood pressure.

This hormone has inhibiting effects on the release of renin by juxtaglomerular apparatus (JGA). Therefore, it inhibits the reabsorption of $N a^{+}$ and water by distal convoluted tubules (DCT) and collecting tubules in the kidneys. It increases the urinary excretion and hence decreases blood volume and blood pressure.

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Similar questions

Q. The correct, match is
I. DCT-Secretion of H

^{+}

and K

^{+}

ions
II. Henle's loop-Reabsorption of glucose, water, and Na

^{+}

ions
III. Podocytes-Attached to parietal layer of Bowmans capsule
IV. JGA-Rise in glomerular blood pressure activates it to release renin.

Q. A decrease in blood pressure/ volume will not cause the release of

Q. Read the following four statements (A-D). Find out the true (T) and false (F) statements :
(a) Catecholamines stimulate the breakdown of glycogen, resulting in an increased concentration of glucose in blood.

(b) Thymosin play a major role in the differentiation of T – lymphocytes which provide cell mediated immunity.

(c) Aldosterone stimulates the reabsorption of

K^{+}

and phosphate ions and excretion of

N a^{+}

and water.

(d) Insulin is a peptide hormone, which reduces the cellular glucose uptake and utilization.

Q. Which of the following statement/statements is/are incorrect?
I) ADH is released if blood has low osmolarity.
II) ADH is released if blood has high osmolarity.
III) Aldosterone facilitates water reabsorption.
IV) ANF causes vasoconstriction.
V) ADH increases water reabsorption.

Which of the following statement is incorrect?
(a) ADH prevents conversion of angiotensinogen in blood to angiotensin
(b) Aldosterone facilitates water reabsorption
(c) ANF enhances sodium reabsorption
(d) Renin causes vasodilation

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Negative Feedback Mechanism for RAAS

Standard XII Biology

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