Questions: 31. Cells responsible for reabsorption of bone 32. Spongy bone 34. Breastbone 35. Haversian canal 36. Formation of bone by osteoblasts 37. Ring of bone around the haversian canal 38. Bone supporting the nasal cavity structure 43. Bone whose length exceeds its width 45. Ear bone referred to as the stirrup

Cells responsible for reabsorption of bone: The answer is osteoclasts. Osteoclasts are specialized cells that break down bone tissue, a process known as bone resorption. This is essential for the maintenance, repair, and remodeling of bones.

Spongy bone: The answer is cancellous bone. Spongy bone, also known as cancellous or trabecular bone, is found at the ends of long bones and in the interior of other bones. It has a porous, honeycomb-like structure that is lighter and less dense than compact bone.

Breastbone: The answer is the sternum. The sternum, commonly known as the breastbone, is a long, flat bone located in the central part of the chest. It connects to the ribs via cartilage and forms the front of the rib cage, helping to protect the heart and lungs.