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The Endowment for Human Development
The Endowment for Human Development
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Heart and Circulatory System


3 weeks

From The Biology of Prenatal Development.Buy Now

Script: 最初の血球が 卵黄嚢に現れると 胎芽全体に 血管が形成され 管状心臓が現れます

殆ど時を同じくして 急速に発育する心臓は 個別の心室が 発達するにつれて 自然に折り込まれていきます

受精後3 週と 1 日で 心臓が 鼓動を打ち始めます

最初に機能を備える身体組織 または 関連器官のグループは 循環器系です

All ages referenced to fertilization, not last menstrual period.
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