Question

select the correct answer.
in what way are the humerus and the femur similar?
a. they both attach their respective limbs to the axial skeleton.
b. they both have similar joints at each end.
c. they both are extremely strong and made only of compact bone.
d. they both have hollow spaces filled with bone - generating cells.
e. they both protect vital organs.

Explanation:

• Option A: The humerus attaches the arm to the axial skeleton (via the shoulder), and the femur attaches the leg to the axial skeleton (via the hip). This is a key similarity.
• Option B: The joints at the ends (shoulder/elbow for humerus; hip/knee for femur) are not similar in structure or function.
• Option C: Both bones have compact and spongy bone, not only compact.
• Option D: While bones have marrow (hollow spaces with cells), this is a general bone feature, not a unique similarity between these two specifically.
• Option E: Neither the humerus nor femur primarily protect vital organs (ribs, skull, etc., do that).

Answer:

A. They both attach their respective limbs to the axial skeleton.