A human embryo after 4 weeks development

A human embryo after 4 weeks development

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Caption: A human embryo after 4 weeks development. The embryo is about 4 millimetres in length from head (top) to tail. At this stage the tubes that comprised the early heart have fused into a common tube in which contractile activity (an early form of heartbeat) is starting. Primordial organs of the thyroid, lungs, liver, pancreas and kidney have been established and are developing.

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Keywords: 4 weeks, embryo, human body

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