The flat surface of the tibia that articulates with the femur is the superior surface of which landmark

It is the superior surface of the medial and lateral condyles. The medial condyle is a projection on the lower extremity of the femur, and the lateral condyle is the other projection on the lower extremity of the femur. The medial condyle is larger than the lateral as it bears more weight from the body.

Nonliving substances, for example, poisons, chemicals, drugs, and outside particles can likewise are antigens. The safe framework perceives and demolishes, or tries to annihilate, substances that contain antigens. Your body's cells have proteins that are antigens. Your safe framework has an astonishing capacity to recognize your body's own cells and outside cells. Every phone conveys protein markers called antigens that distinguish it as self or non-self.