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A. Tick () the correct option.CISESD1.are the thinnest blood vessels.i. Veinsii. Arteries2. What help in clotting of blood?iii. Capillariesi. Plateletsii. RBCSiii. WBCS3.pumps blood to all parts of the body.i. Lungsii. Heartiii. Lever4.keep our heart strong and healthy.i. Less sleepii. Junk foodill. Yoga and exercisecarry oxygen from lungs to different parts of the body.i. Red blood cells ii. White blood cells iii. PlateletsB. Fill in the blanks.1. Size of the heart is about the size of our2.have thick elastic walls.3. All the veins carry impure blood except the5.food.4.connect the arteries to the veins.5. We should avoidandC. Write 'T' for True and 'F' for False.1. The circulatory system comprises of heart and blood.2. A group of organs that perform a particular functionis called organ system3. The heart is a muscular organ that pumps bloodto all parts of body.4. Upper chambers of the heart are called ventricles.​

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