Final answer:
The kneecap in the human body is called the patella, a sesamoid bone found in the tendon of the quadriceps femoris muscle which facilitates knee extension and protection against friction.
Step-by-step explanation:
The word for the kneecap in the human body is patella. The patella, which is a sesamoid bone, is incorporated into the tendon of the quadriceps femoris muscle. This arrangement not only protects the muscle tendon from rubbing against the femur during knee movements but also increases the leverage power of the muscle, improving knee extension. It is important to note that the patella articulates with the femur and not with the tibia, and it serves as a critical component in the knee joint.
The patella, or kneecap, is the largest sesamoid bone in the body. It is a triangular bone that lies anterior to the knee joint and is embedded in the tendon of the quadriceps femoris muscle. The patella articulates with the patellar surface of the femur and prevents rubbing of the muscle tendon against the distal femur.