Osteoclasts & Osteoblasts: Bone Breakdown & Formation Explained

Bone Remodeling Cells

Osteoclasts

Break down bone tissue (bone resorption). Activated when body needs calcium/phosphorus or to replace old/damaged bone.

Osteoblasts

Build new bone tissue; lay down collagen fibers. When active, form osteons (cylinder-shaped bone units).

Balance Is Key

Healthy bones require balanced resorption and formation. Imbalance leads to diseases like osteoporosis (weak, brittle bones from excessive resorption).