Question

in a joint, two moving parts rub against each other, which can erode bone and waste energy in the form of friction. which of the following reduce bone erosion or friction?
correct answer(s)
synovial sacs
cartilage
ligaments
osteocytes
incorrect answer(s)

Explanation:

• Synovial sacs (bursae) are fluid - filled sacs that reduce friction between tissues (such as between tendons and bones).
• Cartilage (articular cartilage) covers the ends of bones in joints. It provides a smooth surface, reducing friction and shock during movement, which helps prevent bone erosion.
• Ligaments connect bones to other bones. They help stabilize the joint, but their main function is not directly related to reducing friction or bone erosion in the way that synovial sacs and cartilage do.
• Osteocytes are bone cells. Their role is in bone maintenance (such as regulating bone mineralization and remodeling), not in reducing joint - related friction or bone erosion.

Answer:

synovial sacs, cartilage