MCAT Biology Question 163: Answer and Explanation
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Question: 163
13. Which of the following bones is NOT a part of the appendicular skeleton?
- A. The triquetrum, one of the carpal bones
- B. The calcaneus, which forms the heel
- C. The ischium, one of the fused pelvic bones
- D. The sternum, or breastbone
Correct Answer: D
Explanation:
The axial skeleton consists of the skull, vertebral column, rib cage, and hyoid bone. The sternum is a point of attachment of the rib cage and is thus a part of the axial, not appendicular, skeleton. The limb bones, pectoral girdle, and pelvis are all part of the appendicular skeleton.