Question

Which of the following structures joins bone to bone?

• A. Tendons
• B. Ligaments
• C. Cartilage
• D. Lacunae

Answer 1

The correct option is B Ligaments

Tendons join muscle to bones.
Ligaments join bone to bone.
Cartilage are specialised connective tissues. These are semi rigid and flexible. In most vertebrates, most embryonal cartilage are replaced by bones in adults. They are found at the tip of the nose and outer ear (auricle/pinna). Pinna is a characteristic feature of mammals only. Pinna muscles are vestigial in humans. These are comparatively avascular. Cells of cartilage are called chondrocytes.
Bones are specialised connective tissues. These are hard and non- pliable. The ground substance is made up of calcium salts and collagen. Ossein protein is present in bones. Cells of bone tissue are called osteocytes. They are present in spaces called lacunae. Osteoblasts are bone forming cells. Osteoclasts are bone destroying cells. They are required for bone remodelling.