Question

Assertion : Human heart is four chambered
Reason : Vena cava carries deoygeneted blood

Answer 1

Answer:

(b) Both assertion and reason are true but R is not the correct explanation of A.

Explanation:

Human heart has four chambered heart and also vena cava carries deoxygenated blood.

But human heart has 4 chambered heart to prevent mixing of oxygenated blood with deoxygenated blood, hence there is no relation between assertion and reason.

Answer 2

Both assertion and reason are correct. But reason is not the correct explanation of the assertion.

• Four chambered heart is present in humans which involves the precise separation between the deoxygenated and the oxygenated blood.
• Deoxygenated blood is obtained in the right atrium from the lower as well as the upper parts of the body.
• Deoxygenated blood is pumped out from the right ventricle to the lungs through the pulmonary artery for oxygenation.
• Human has chambers of the heart that carry oxygenated blood see the right ventricle and the right atrium.
• Vena cava is responsible for delivering deoxygenated blood to the right atrium. Blood is carried by the superior vena cava from the upper torso and the head whereas the blood is carried by the inferior vena cava from the lower body.

Hence, Vena cava has no connection with the four chambers of the heart. So, Both assertion and reason are correct. But reason is not the correct explanation of the assertion.