Question

Consider the following four statements (i-iv) and select the option that correctly identifies the true (T) and false (F) ones.
(i) Atrial natriuretic factor can cause vasodilation( dilation of blood vessels) and thereby decreases the blood pressure.
(ii) On an average, $60-70$ gm of urea is excreted out per day.
(iii) Sebaceous glands eliminate certain substances like $NaCl$ , urea and lactic acid through sebum.
(iv) PCT is lined by simple cuboidal brush border epithelium which increases the surface area for reabsorption.

• A. (i) $F$ , (ii) $F$, (iii) $T$, (iv) $T$
• B. (i) $F$ , (ii) $T$, (iii) $T$, (iv) $T$
• C. (i) $T$ , (ii) $F$, (iii) $F$, (iv) $T$
• D. (i) $T$ , (ii) $T$, (iii) $F$, (iv) $T$

Answer 1

The correct option is C (i) $T$ , (ii) $F$, (iii) $F$, (iv) $T$

An increase in blood flow to the atria of the heart causes the release of atrial natriuretic factor (ANF). ANF causes vasodilation and therefore, decreases the blood pressure. Maximum reabsorption takes place in PCT. PCT is lined by simple cuboidal brush border epithelium which increases the surface area for reabsorption. On an average $25-30$ gm of urea is excreted out per day. Sebaceous glands eliminate certain substances like sterols, hydrocarbons and waxes through sebum.

So the correct answer is '(i) $T$ , (ii) $T$, (iii) $F$, (iv) $T$'.