19. Which of following is classified as a long bone?
Answer: C
The tibia is classified as a long bone.
The tibia, commonly known as the shinbone, is categorized as a long bone due to its elongated shape and structure, which is characteristic of this type of bone.
A) Carpal
Carpals are classified as short bones, not long bones. They are small and cube-like in shape, found in the wrist, and do not have the same elongated structure as long bones.
B) Rib
Ribs are classified as flat bones. They serve to protect vital organs in the thoracic cavity and have a broad, flat shape rather than the elongated shape typical of long bones.
C) Tibia
The tibia is a long bone, characterized by its length and role in supporting weight and facilitating movement in the lower leg. This classification is based on its structure, which includes a shaft and two ends, aligning it with the defining features of long bones.
D) Vertebrae
Vertebrae are classified as irregular bones due to their complex shape and function in protecting the spinal cord. They do not fit the criteria for long bones, which are more uniform in shape and primarily serve to support and facilitate movement.
Conclusion
The tibia is definitively the correct answer as it meets all criteria for classification as a long bone, including its elongation and structural function. In contrast, the other options—carpals, ribs, and vertebrae—do not possess the characteristics of long bones, thus making them incorrect choices.