Final answer:
The patella, or kneecap, is an example of a sesamoid bone, which is embedded within tendons to protect them and increase muscle leverage. Option D.
Step-by-step explanation:
An example of a sesamoid bone is the patella, also known as the kneecap. Sesamoid bones are small, round bones that are embedded within the tendons of muscles, particularly where the tendons cross over joints.
The primary function of these bones is to help protect the tendons from stress and wear due to muscle contractions and joint movements, as well as to increase the leverage power of muscles, which enhances their effectiveness. The patella is the largest sesamoid bone in the body and is found in every person.
It is part of the tendon of the quadriceps femoris muscle, which extends across the knee to attach to the tibia. The patella articulates with the femur, protecting the tendon from rubbing against it during knee movement and providing increased leverage for knee extension. Option D.