What structure primarily acts as the shock absorber in joints?

Cartilage is the structure that primarily acts as a shock absorber in joints. It is a type of connective tissue that is both resilient and flexible, allowing it to absorb and distribute the forces exerted on the joint during movement. Cartilage covers the ends of bones at joints, providing a smooth surface for articulation and reducing friction between the bony surfaces. Additionally, its ability to compress and expand helps in cushioning impacts during activities such as running or jumping, protecting the underlying bones from damage.

Tendons, which connect muscles to bones, play a crucial role in facilitating movement but are not involved in shock absorption. Ligaments connect bones to other bones and provide stability to joints, yet they do not have the same capacity for absorbing shock. Bones themselves provide strength and structure but are rigid and do not absorb shock as effectively as cartilage. Overall, cartilage's unique properties make it the primary structure involved in shock absorption within joint mechanics.