What is Collagen?
Collagen is your body's glue. Its name comes from the ancient Greek word "kola", which means "glue," and "gen", which means "something that causes." Collagen is the main ingredient in the special tissues that hold your body together. These are called connective tissues and they are found throughout your body. Ligaments and tendons are connective tissues, so too, are your bones, which form the frame that supports the rest of you.

What are joints?
Joints are the points of connection between two bones. Your joints let bones move in certain directions and prevent them from moving the wrong way. Some joints let bones move only up and down, while others let them swivel. Joints cannot work without muscles.

What are tendons?
Tendons are tough tissues that connect muscle to bone. When the muscle contracts, it moves the bone in the joint. Hence your knees bend or your arms extend for balance.

What is cartilage?
Cartilage is the soft part of bones that line the edges of the bones and become the "interface" between bones.

What are osteoclasts and osteoblasts?
Osteoblasts are special cells that re-build bone. Osteoclasts are special cells that break down bone.