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

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.

What prevents backflow of blood inside the heart during contraction?

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

Choose the correct statement that describes arteries.