Osteoclast.

Osteoclasts are one of two main categories of cells in the bones: osteoclasts and osteoblasts. Osteoclasts remove bone and work in conjunction with osteoblasts, which build bone. The bone absorption and removal performed by osteoclasts is important because it allows the body to keep existing bones strong and build new bone when necessary. Osteoclasts play a key role in how infants and children grow and in how bones heal after a fracture. They also contribute to the health of a person's skeleton during aging.