(b) Capillaries
Explanation: Capillaries are the thinnest blood vessels with one-cell-thick walls, allowing easy exchange of gases, nutrients, and waste between blood and tissues.
(i) Blood vessel A – It carries carbon dioxide rich blood to the lungs.(ii) Blood vessel B – It carries oxygen rich blood from the lungs.(iii) Blood vessel B – Left atrium relaxes as it receives blood from this blood vessel.(iv) Blood vessel A – Right atrium has thick muscular wall as it has to pump blood to this blood vessel.The correct statements are(a) (i) and (ii) only(b) (ii) and (iii) only(c) (ii), (iii) and (iv)(d) (i), (ii) and (iii).
Question
Thin walled blood vessels are called (a) Aorta (b) Capillaries (c) Arteries (d) Vena cava
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