Red blood cells in animals arise from which of the three germ layers?

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BlackTom AI · Accepted Answer

The question asks: Red blood cells in animals arise from which of the three germ layers?
Option 1: Mesoderm. This is the correct lineage because hematopoietic cells, including red blood cells, originate from mesodermal tissues such as the mesoderm-derived blood-forming organs (e.g., bone marrow) and embryonic sites like the yolk sac. The mesoderm gives rise to the circulatory system and its components, including erythroid cells.
Option 2: Ectoderm. The ectoderm mainly forms structures such as the epidermis, nervous system, and sensory organs. It does not give rise to blood cells, so this choice misattributes hematopoietic origin to the wrong germ layer.
Option 3: Endoderm. The endoderm develops into the lining of internal organs and associated glands (e.g., gut lining, liver, pancreas). It is not the source of red blood cells, so this option is incorrect for hematopoiesis.
In summary, red blood cells are derived from mesodermal lineage due to their association with the circulatory and hematopoietic systems, whereas ectoderm and endoderm form entirely different tissue types.

Red blood cells in animals arise from which of the three germ layers?

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