Questions: Which of the following bones belongs to the axial skeleton? (A) patella (B) humerus (C) carpals (D) sternum

The answer is (D): sternum.

Explanation for each option: (A) Patella: The patella, or kneecap, is a bone located in the knee joint. It is part of the appendicular skeleton, which includes the bones of the limbs and girdles.

(B) Humerus: The humerus is the long bone in the upper arm. It is also part of the appendicular skeleton.

(C) Carpals: The carpals are the bones that make up the wrist. These bones are part of the appendicular skeleton as well.

(D) Sternum: The sternum, or breastbone, is a long flat bone located in the center of the chest. It is part of the axial skeleton, which includes the bones of the skull, vertebral column, and thoracic cage.

Summary: The sternum belongs to the axial skeleton, while the patella, humerus, and carpals are part of the appendicular skeleton. Therefore, the correct answer is (D): sternum.