Biology / Bio 3197 · Atom · ~20 seconds
Heart Chambers and Valves
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A mammalian heart has four chambers — two atria receiving blood, two ventricles pumping it out — separated by valves enforcing one-directional flow.
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The mitral valve stops blood flowing backward from left ventricle into left atrium during contraction.
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A failing valve lets blood leak backward while chamber structure stays intact — distinct problems.