Q6 of 367 Page 72

What stops blood from flowing backwards through the heart?

The valves present in the heart prevent the blood flowing backward through the heart.


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4

Veins and arteries carry blood. Which of these carry blood :

(a) away from the heart?


(b) back to the heart?

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Where does blood absorb oxygen?

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Name (i) largest artery, and (ii) largest vein, in our body.

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What gaseous waste products are excreted by plants?