What strong connective tissues hold long bones together at joints?

The correct answer is ligaments, as they are specialized connective tissues that connect bones to other bones at joints, providing stability and support. Ligaments contain a high amount of collagen fibers, which gives them strength and elasticity, allowing them to withstand the stress placed on them during movement.

By connecting bones at the joints, ligaments help to maintain proper alignment and prevent excessive movement that could lead to injury. This function is critical in activities involving joint mobility and stability, such as walking, running, and lifting.

While cartilage plays a role in cushioning joints and allowing smooth movement, it does not connect bones to one another. Tendons, on the other hand, connect muscles to bones and are important for transmitting the force generated by muscles to facilitate movement. Muscles are responsible for generating movement but do not serve the purpose of connecting bones at joints. Thus, ligaments specifically fulfill the role of holding long bones together at joints effectively.