WEBVTT

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그래서 당신이 보고있는 것은

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당신의 몸 안에 있는 가장 놀라온 장기들 중 하나입니다. 이것은 사람의 심장입니다

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그리고 이것은 혈관들이 있는 체로 보여지고 있고 당신은 혈관이

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여기에서 들어오고 나오는 것을 볼 수 있습니다

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하지만 심장은 그 중심에서 펌프이고 이 펌프는 우리가

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심장을 몸에서 가장 열심히 일하는 장기라고 말하는 이유인데, 심장은

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