The chicken heart has 4 chambers. The 4 chambers include: the right atrium, the right ventricle, the left atrium and the left ventricle.

The aorta is the artery that carries oxygenated blood award from the heart and to the rest of the body. This artery contains a curvature in the superior portion of the heart called the aortic arch. In chickens this arch reflects to the right but when comparing this structure to mammals this curvature reflects differently. In mammals the aortic arch reflects to the left.

The heart is enclosed in the pericardial sac. This sac is a thin membrane that holds the heart in place and functions as a protective layer.

On the right side of the heart, the pulmonary artery is supplying deoxygenated blood to the lungs to be oxygenated. The blood is then returning to the left atrium through the pulmonary veins. The blood then goes through the left ventricle and is moved throughout the body by the aorta and attaching arteries. The deoxygenated blood then returns to right atrium through the caudal and cranial vena cavas. The cycle repeats.