Bone marrow puncture needle is often used clinically to extract red bone marrow for the diagnosis of blood diseases, because ( ) A. Dense blood vessels in the bone marrow B. red marrow

The basic structure of bone consists of three parts: periosteum, bone and bone marrow;

Among them, the bone marrow is located in the bone marrow cavity. In childhood, the bone marrow is red and has hematopoietic function. In adulthood, the red bone marrow becomes yellow bone marrow, which loses the hematopoietic function and has a nutritional effect on the bones. Only when there is excessive blood loss, the red bone marrow will become yellow. hematopoiesis. In the human cancellous bone, there is life-long hematopoietic red bone marrow. In clinical practice, bone marrow aspirate is often used to extract red bone marrow for the diagnosis of blood diseases, because red bone marrow has hematopoietic function.

So choose B.

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