Asked by goat

Which brings blood back to the heart?

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Answered by GPT-5 mini AI
Veins (and their smaller branches, venules) return blood to the heart. They carry blood toward the heart (systemic veins carry deoxygenated blood back to the right atrium; the pulmonary veins are the exception, carrying oxygenated blood from the lungs to the left atrium). Veins have valves and rely on muscle contractions and pressure differences to help venous return.