Which kinds of tissues make up bones?

There are two main types of tissues that make up bones: osseous tissue and bone marrow.

1. Osseous tissue, also known as bone tissue, is the hard, calcified material that makes up the majority of the bone. It is composed of a matrix of collagen fibers and other proteins that are reinforced with calcium phosphate and other minerals. Osseous tissue is divided into two types: compact bone and cancellous bone.

* Compact bone is dense, hard, and strong. It forms the outer layer of the bone and provides protection and support.

* Cancellous bone is lighter and less dense than compact bone. It is found in the interior of the bone and contains a network of trabeculae, or thin bone struts. Cancellous bone helps to absorb shock and provides a space for bone marrow.

2. Bone marrow is the soft, gelatinous tissue that fills the spaces within the bones. It is composed of a mixture of cells, including stem cells, blood-forming cells, and fat cells. Bone marrow is the site of hematopoiesis, or the production of blood cells.