• 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.

彼かれは 心臓しんぞうの 手術しゅじゅつを 受うけた。
He underwent heart surgery.

臓器ぞうき提供ていきょうの 意思いしを 示しめした。
She expressed her intention to donate her organs.