Question

Hey Mates, Plz explain Double Circulation (complete process)...!!!!

Answer 1

this type of circuit is found in crocodiles birds and mammels. their heart is a four chambered with two atria and two ventricles.here oxygenated and deoxygenated blood are completely seperated.
no sinus venosus and truncus arteriosus present,but two pacemakers i.e SA node and AV node are present .
it involves two circuit
a. systemic circulation.
b.pulmonary circulation.

Answer 2

Answer:

The pulmonary vein brings the oxygenated blood from the lungs in the left atrium of the heart.

The left atrium contracts and pumps blood into the left ventricle through the valve.

On contraction of left ventricle, the oxygenated blood enters the largest artery aorta. The blood travels from aorta to the smaller arteries and distributed to the organs of whole body.

Superior vena cava collects blood from the upper parts of the body and inferior vena cava collects from the lower parts of the body and carry it to the right atrium of the heart.

The right atrium pumps deoxygenated blood into the right ventricle through the valve.

When the right ventricle contracts, the deoxygenated blood enters the lungs through the pulmonary artery where it is purified.