Question

ASSERTION: The muscular walls of ventricle are thicker than auricles

REASON: This helps in preventing the backflow of blood.

a. Both ASSERTION and REASON are true

b. ASSERTION is true but REASON is false

c. ASSERTION is false but REASON is true

d. BOTH ASSERTION and REASON are False​

Answer 1

b. ASSERTION is true but REASON is false

Explanation:

Because ventricles have to do more work as compare to atria. Ventricles pump blood into various organs and the pressure of blood flowing in them is more than that of articles.

Answer 2

b. ASSERTION is true but REASON is false is correct.

• Muscular walls of ventricles are thicker as the function of the ventricle is to pump blood to all the organs. This requires high pressure in ventricles.
• The backflow of blood is prevented by the presence of valves. They cause circulation of blood in one direction only.
• Thus, the first statement is correct but the second statement is caused by valves in veins.