Question

In embryonic stage, erythrocytes develop from ________________.

• A. Bone marrow
• B. Liver and kidney
• C. Spleen and kidney
• D. Liver and spleen

Answer 1

The correct option is D Liver and spleen

In developing embryos, blood formation occurs in aggregates of blood cells in the yolk sac, called blood islands. As development progresses, blood formation occurs in the spleen, liver, and lymph nodes. When bone marrow develops, it eventually assumes the task of forming most of the blood cells for the entire organism.

So, the correct answer is 'Liver and spleen'.