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Veins are a critical component of the circulatory system [1], [2], serving as the vessels through which deoxygenated blood returns to the heart after oxygen has been exchanged with cells [3].

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Sources

7 Major Organ Systems: Functions and Connections instituteofhumananatomy.com Institute of Human Anatomy 2 facts

procedureSystemic circulation involves the left side of the heart pumping oxygen-rich blood through the aorta, which branches into smaller arteries and capillaries to exchange oxygen and nutrients with cells, before deoxygenated blood returns to the heart via veins.

quoteYour circulatory system, or cardiovascular system, supplies oxygen and nutrients to your whole body and removes waste through your blood. Your heart pumps blood that flows through your arteries, veins and capillaries. These blood vessels and your heart form your circulatory system. They work together to ensure your cells have what they need.

List of systems of the human body - Wikipedia en.wikipedia.org Wikipedia 1 fact

referenceThe circulatory system circulates blood to transport nutrients, waste, hormones, oxygen, and carbon dioxide, and aids in maintaining pH and temperature, utilizing blood, the heart, arteries, veins, and capillaries.