Sure! Here are the definitions of the provided terms in their simplest form:
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Biologically active substances: Compounds that have an effect on living organisms.
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Capillaries: Tiny blood vessels that connect arteries and veins, allowing the exchange of nutrients and waste.
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Arteries: Blood vessels that carry blood away from the heart to the rest of the body.
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Flavonoids: Natural compounds found in plants that may have health benefits, often acting as antioxidants.