3D Model: A 3D Anatomical Animation Of A Human Heart, Rotating Slowly In Midair Against A Neutral, Clean Medical Background. The Heart Is Realistically Modeled With Accurate Textures And Colors, Showing External And Internal Structures. The Animation Begins With The Whole Heart Viewed From The Front, Then Smoothly Transitions Into A Cross-section View Revealing Internal Chambers. Highlight The Four Main Chambers: Right Atrium, Right Ventricle, Left Atrium, And Left Ventricle. Include Visible Arteries And Veins: The Aorta, Pulmonary Artery, Pulmonary Veins, And Vena Cava. The Animation Should Clearly Depict Valves Opening And Closing In Slow Motion, Showing Blood Flow Direction. Use Smooth Camera Transitions, Detailed Textures, And Soft Lighting Suitable For Educational Use In Biology Classes.