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The circulatory system of vertebrates

7-grade · Chapter: Transport of substances in living organisms

In this topic

Why blood travels in circles
Fish, amphibians and reptiles
Birds and mammals
The two circuits

Key terms

Heart
Atrium
Ventricle
Artery
Vein
Capillary
Aorta
Arterial blood
Venous blood
Pulmonary circuit
Systemic circuit
Warm-bloodedness

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