Q3 of 30 Page 71

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Which structures of the heart control the flow of the blood? ( )

The valves prevent the backward flow of blood.

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1

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The term cardiac refers to which organ in the body?

 2

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On which side of the human heart is low in oxygen?

 4

Which of the following opinion is correct? ( )

 5

An aphid pierces is proboscis into the…………….to get plant juices.