The 'sternum' is a very important bone that protects the

Correct Answer: B

Rationale: The sternum (breastbone) is a flat bone in the chest that, along with the ribs, forms the rib cage, primarily protecting the heart. It also shields the lungs to some extent, but its central role is heart protection. The brain is protected by the cranium, and the liver is below the diaphragm.

Correct Answer: A

Rationale: The coccyx (tailbone) consists of four small vertebrae that fuse in adulthood into a single structure. The sacrum, while also fused (five vertebrae), is larger and supports the pelvis, making 'coccyx' the better fit for 'very small.'

Correct Answer: B

Rationale: Ribs decrease in length from 8 to 12 as they curve around the chest; rib 8 is longer, while ribs 11 and 12 (floating) are shortest, reflecting their reduced role in enclosing the thorax.

Correct Answer: B

Rationale: The radius is wider distally (near the wrist) and tapers proximally (toward the elbow), aiding wrist movement. Thus, it goes from wide to thin 'down' the arm toward the elbow.

Correct Answer: A

Rationale: Yes, an interosseous membrane connects the tibia and fibula along their lengths, similar to the forearm, providing stability and a surface for muscle attachment.