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MCAT Question A Day - 7/9/13 - Answer!

Which of the following is (are) not protected by parts of the axial skeleton?

A.  Brain
B.  Heart and lungs
C.  Spinal cord
D.  None of the above

The correct answer is (D). The axial skeleton includes the skull, vertebral column, and thoracic cage (sternum and ribs). Thus, all choices are protected by these bony regions. The sternum (breast bone) is one of the flat bones in which blood cells develop.