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:

• Option A: Pivot joints exist in both axial (e.g., neck) and appendicular (e.g., forearm) skeletons.
• Option B: Antagonistic muscle pairs attach to both skeleton types.
• Option C: Red bone marrow is present in bones of both skeletons.
• Option D: Processes for articulation are found in both skeleton types.
• Option E: Only the axial skeleton's thoracic cage (ribs, sternum, vertebrae) protects the heart and lungs; the appendicular skeleton supports limb movement, not this vital organ protection.

Answer:

E. It protects the heart and lungs.