What do tendons primarily connect?

Tendons primarily connect muscle to bone, playing a crucial role in the musculoskeletal system by facilitating movement. When a muscle contracts, the tendon transmits this force to the bone, allowing for joint movement. This connection is vital for the effective functioning of the muscular system, as it ensures that the bones are moved in a coordinated manner when muscles engage.

In this context, it's important to understand that tendons are made of fibrous connective tissue, providing the necessary strength and elasticity to withstand the forces exerted during physical activity. This enables smooth and controlled movements across joints.

In contrast, the other options do not accurately represent the primary function of tendons. For example, muscles connect to muscles through structures called fascial layers rather than tendons. Skin does not form a direct connection to muscles, as skin primarily serves as an outer protective layer and does not facilitate movement. Lastly, bones connect to bones through ligaments, which are different structures designed to stabilize joints rather than transmit forces from muscles.