Each organism has a job in a community
Answer: Capillaries connect the arterial system — which includes the blood vessels that carry blood away from your heart — to your venous system. Your venous system includes the blood vessels that carry blood back to your heart. The exchange of oxygen, nutrients, and waste between your blood and tissues also happens in your capillaries.
There are approximately 4.7 to 5.5 liters and 1.2 to 1.5 gallons of blood in a human's body.
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