Which system includes bones, joints, and cartilage?

The skeletal system is the correct answer because it is specifically composed of bones, joints, and cartilage, which together provide structural support, shape, and protection for the body. Bones form the rigid framework that holds the body together and protects vital organs, while joints connect the bones, allowing for movement. Cartilage, a flexible connective tissue, provides cushioning between bones and also contributes to the structure of certain parts of the body, such as the nose and ears.

In contrast, the respiratory system is involved in the process of breathing and gas exchange, primarily consisting of organs like the lungs and trachea. The nervous system is responsible for transmitting signals between different parts of the body and includes the brain, spinal cord, and nerves. The muscular system, while it works closely with the skeletal system to facilitate movement, is primarily made up of muscles rather than bones and cartilage. Thus, the skeletal system is uniquely characterized by its inclusion of bones, joints, and cartilage.