1b) transported
c) Blood
2a) tubes
b) Heart
c) i) Arteries : carry blood away from the heart to other parts of the body.
ii) Veins : carry blood from the body back to the heart.
iii) capillaries : connect arteries to veins.
3.
a) pump
b) muscle
c) heartbeat, 70
e) when we exercise, our heart beats faster so that more blood and hence food and oxygen can reach different parts of our body faster.
f) carbon dioxide.
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