Final answer:
Bone marrow is the major tissue that fills the central cavity of long bones and produces blood cells through hematopoiesis. It is divided into red marrow, responsible for producing all types of blood cells, and yellow marrow, which stores adipose tissue.
Step-by-step explanation:
Bone marrow is the major tissue filling the central cavity of a long bone. It is responsible for producing blood cells through a process called hematopoiesis.
There are two types of bone marrow: red marrow, where hematopoiesis occurs, and yellow marrow, which stores adipose tissue.
Red marrow produces red blood cells, white blood cells, and platelets. It is located in the epiphyses of long bones, which are the rounded ends.
Yellow marrow, on the other hand, stores triglycerides in adipocytes and can serve as a source of energy.