Human Circulatory System Diagram - Anatomy & Blood Flow Pathways #1499035 (License: Personal Use)

This anatomical illustration depicts the complete double-loop circulatory system: deoxygenated blood enters the right atrium via superior and inferior vena cava, flows through the right ventricle to the pulmonary artery, oxygenates in lung capillaries, returns via pulmonary veins to the left atrium, then pumps through the left ventricle into the aorta for systemic delivery. Arteries (red) carry oxygen-rich blood away from the heart; veins (blue) return oxygen-poor blood, with capillary networks enabling gas exchange in lungs, head/forelimbs, abdominal organs, and hind limbs.

Used in biology, anatomy, and physiology educational resources-textbooks, online courses, and medical training sites-to teach cardiovascular function, blood flow direction, and structural relationships. Matches user intent for visual learning, exam prep, or clinical reference.