EVERYDAY SCIENCE

Detailed explanation-1: -Listen to pronunciation. (bone MAYR-oh) The soft, spongy tissue that has many blood vessels and is found in the center of most bones. There are two types of bone marrow: red and yellow.

Detailed explanation-2: -In adult humans, bone marrow is primarily located in the ribs, vertebrae, sternum, and bones of the pelvis. Bone marrow comprises approximately 5% of total body mass in healthy adult humans, such that a man weighing 73 kg (161 lbs) will have around 3.7 kg (8 lbs) of bone marrow.

Detailed explanation-3: -Healthy bone marrow is an essential part of the body, as it contains stem cells that produce blood cells and the cells that make up the immune system. Bone marrow stem cells can mature into several different kinds of cells, each of which has its own vital functions within the body.

Detailed explanation-4: -In immunology and anatomy textbooks the bone marrow is described as a typical “primary lymphoid organ” producing lymphoid cells independent of antigens. The hematopoietic bone marrow is largely age-dependent organ with great anatomical and functional differences among various species.