spongy tissue inside bones producing blood cells
Bone marrow is a spongy tissue found inside certain bones, such as the hip and thigh bones. It is crucial for producing blood cells, including red blood cells, white blood cells, and platelets, which are essential for carrying oxygen, fighting infections, and clotting blood, respectively. There are two types of bone marrow: red marrow, which is active in hematopoiesis (blood cell production), and yellow marrow, which primarily stores fat.