Q13 of 56 Page 170

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

Hippocampus, exocetus and anabas belong to the family of fishes. Fishes have 2 chambered heart, one atrium and one ventricle. Blood is pumped to the gills by heart to be re-oxygenated, from where the blood flows to rest of the body parts and returns back to the heart in just one circulation. Fishes have low blood pressure in body capillaries due to single circulation.

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11

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

(i) Left atrium receives oxygenated blood from different parts of body while right atrium receives deoxygenated blood from lungs.


(ii) Left ventricle pumps oxygenated blood to different bod parts while right ventricle pumps deoxygenated blood to lungs.


(iii) Left atrium transfers oxygenated blood to right ventricle which sends it to different body parts.


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

 12

What prevents backflow of blood inside the heart during contraction?

 14

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

 15

Which is the correct sequence of air passage during inhalation?