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How the heart beats, step 1
How the heart beats, step 2
How the heart beats, step 3
Diagram of capillary network running between arteriole and venule
Six red blood cells
Illustration of shut valve stopping backward flow of blood
Illustration of Crayfish (Austropotamobius), showing circulatory system
Illustration of open valve with arrow showing direction of blood flow
Cross section illustration of Sea Anemone
Illustration of human cardiovascular system
Cross section biomedical illustration of cardiovascular system and respiratory system in child
