Vertebrate Hearts: 2, 3, 4 Chambers

Also called

vertebrate hearts · two-chambered heart · three-chambered heart · four-chambered heart · fish heart · frog heart · amphibian heart · reptile heart · crocodile heart · bird heart · mammal heart · single circulation · double circulation · mixing of blood · warm-blooded · cold-blooded · हृदय · कक्ष · रक्त परिसंचरण

Topics

• A fish heart has two chambers, one atrium and one ventricle, and pumps only deoxygenated blood.
• In a fish, blood goes heart → gills → body → heart: one loop through the heart each round, called single circulation.
• Amphibians and most reptiles have three chambers: two atria and one ventricle, where the two kinds of blood mix.
• Crocodiles have four chambers, but a small opening between their main arteries lets a little blood cross when they dive.
• Birds and mammals have four chambers; a complete septum keeps oxygenated and deoxygenated blood apart.
• In double circulation, blood passes through the heart twice each round: once to the lungs and once to the body.
• Keeping the two kinds of blood apart gives a rich oxygen supply, which warm-blooded birds and mammals need.
• The right side of every heart handles blood returning from the body; the left side handles blood from the lungs.

About this model

A GLB file of about 503 KB, shown in Lably's 3D viewer and, on a phone, placed in your room with AR. Credit: Model, science and animation: Lably (built procedurally with three.js; no downloaded meshes). | CC BY 4.0. Original geometry and animation made for Lably.

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