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anatomy guide

Parrot cardiovascular system — avian heart and circulation

Overview of the parrot's circulatory system — a large, fast four-chambered heart, a right-sided aortic arch, nucleated red blood cells, and a renal portal system.
General educational reference only — not clinical or veterinary advice. Anatomy varies between individual animals; consult a licensed veterinarian for any health concern.

A large, fast four-chambered heart

The parrot's heart has four chambers — two atria and two ventricles — and lies in the cranial part of the body cavity within a pericardial sac. Relative to body mass the avian heart is larger than a comparable mammal's and beats considerably faster, sustaining the high metabolic rate that flight demands. The left ventricle wall is much thicker than the right.

Valves and the right aortic arch

The left atrioventricular valve is a membranous flap anchored by cords, but the right atrioventricular valve is unusual: a single muscular flap with no cords attached. Birds also retain only the right aortic arch, so the main artery leaving the heart curves to the right — the mirror image of the mammalian arrangement.

Blood and portal circulation

Blood follows the same two loops as in mammals, a pulmonary circuit through the lungs and a systemic circuit through the body, with oxygen-rich and oxygen-poor blood kept fully separate. Avian red blood cells are oval and keep their nuclei, unlike the round, anucleate cells of mammals. Birds also have a renal portal system that routes venous blood from the caudal body through the kidneys.

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More Parrot anatomy

Respiratory systemDigestive systemSkeletal systemUrinary systemIntegumentary system

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