• 臓器ぞうき — internal organ
• 心臓しんぞう — heart
• 肝臓かんぞう — liver
• 腎臓じんぞう — kidney
• 臓物ぞうもつ — entrails / offal

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臓 combines ⺼ (flesh, body) with 蔵 (storehouse). This suggests the organs are “stored inside the body,” functioning as hidden but essential parts for life. Common in medical terms and everyday health contexts.