Question

what is double circulation how it happens

Answer 1

when blood pass from our heart two times in one cycle this process is known as double circulation .
part of blood is as follows _
firstly blood is collected from superior and inferior Vena cava to right atrium now through tricuspid valve it will go to right ventricle now through Pulmonary artery it will go to lungs and from pulmonary veins it will come back to left artium now through bicuspid wale it will come to left ventrical and from their through arota it transfer to whole body.

now you can see here that our blood is going from heart to lungs and from lungs it's coming back to heart it means blood is passing through heart 2 times so, this is known as double circulation of blood..
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Answer 2

when blood passes the heart twice from the body it is termed as double circulation.when we breathe the alveoli catches the atmospheric oxygen and mixes with haemoglobin and known as oxy haemoglobin. then deoxygenated blood in vein passes from heart to different body parts .so is called double circulation