Q17 of 79 Page 48

What prevents backflow of blood inside the heart during contraction?

Valves prevent the backflow of blood inside the heart during contraction. They allow the flow of blood in only one direction.

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15

During respiration exchange of gases take place in

 16

Which of the following statement (s) is (are) true about heart?

1. Left atrium receives oxygenated blood from different parts of body while right atrium receives deoxygenated blood from lungs


2. Left ventricle pumps oxygenated blood to different body parts while right ventricle pumps deoxygenated blood to lungs


3. Left atrium transfers oxygenated blood to right ventricle which sends it to different body parts


4. Right atrium receives deoxygenated blood from different parts of the body while left ventricle pumps oxygenated blood to different parts of the body.

 18

Single circulation i.e., blood flows through the heart only once during one cycle of passage through the body, is exhibited by

 19

In which of the following vertebrate group/groups, heart does not pump oxygenated blood to different parts of the body?