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The walls of ventricles are much thicke...

The walls of ventricles are much thicker than atria. Explain. 

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The structre of heart of fishes,reptiles,birds and mammals show many structure of evolutinoary significance.Thiker walls of ventricles is one of them
Ventricles have thickes walls because these are mainly involved in pumpuing the blood to the body parts with certain pressure.
The walls of the left ventrivcle is about 3 times thicker from the right ventricle,while the atria acts as a collecting chambers for the blood which is starting to the heart thus have thin walled.Also they have to force the blood into the ventricles that lies just below there thus atria have thin walls.
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Give reasons for the following : (i) The muscular walls of ventricles are thicker than the walls of atria. (ii) Arteries have thick elastic walls. (iii) Veins have valves .

The wall of left ventricle is thicker than right ventricle.

Knowledge Check

  • Assertion (A): The muscular walls of ventricles are thicker than auricles. Reason (R): This helps in preventing the back flow of blood.

    A
    Both A and R are true and R is the correct explanation of A.
    B
    Both A and R are true but R is NOT the correct explanation of A.
    C
    A is true but R is false.
    D
    A is false and R is true.

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