Question

select the correct answer. which statement applies only to the axial skeleton, not the appendicular skeleton? a. it contains a pivot joint. b. it has muscles attached that work in pairs. c. it contains red bone marrow. d. it possesses fossa for bone articulation. e. it protects the heart and lungs.

Explanation:

The axial skeleton consists of the skull, vertebral column, and thoracic cage. The thoracic cage (ribs and sternum) protects the heart and lungs (as in option E). Pivot joints (option A) are in both axial (e.g., atlanto - axial joint) and appendicular (e.g., proximal radioulnar joint) skeletons. Muscles attached in pairs (option B) is a general musculoskeletal feature. Red bone marrow (option C) is in many bones of both skeletons. Fossa for bone articulation (option D) is a general bone feature.

Answer:

E. It protects the heart and lungs.