Question

The rib cage has twelve pairs of ribs. The last two pairs are known as ........... ribs.

• A. Sternum
• B. Girdle
• C. Floating
• D. Incomplete

Answer 1

Answer: (C)

Floating

• Rib cage is formed by the vertebral column, ribs, and sternum and encloses the heart and lungs.
• There are 24 ribs which are arranged twelve on each side. The first seven pairs of ribs join the breastbone known as sternum in the center of the chest.
• The front ends of the 8${}^{th}$and 10${}^{th}$ pairs are connected to the ribs above them.
• The 11${}^{th}$ and 12${}^{th}$ pairs are called floating ribs, as they are anchored in place only by connective tissue so they are floating and are called floating ribs.
  So, the correct answer is option C.