What is found at the extremities of long bones?

• A. Compact tissue
• B. Spongy tissue
• C. Nervous tissue
• D. Elastic tissue

Answer: (B)

The extremities of long bones are primarily composed of spongy tissue, also known as cancellous bone. This type of bone tissue has a porous structure, making it lighter and less dense than compact bone, which is found in the shaft or diaphysis of long bones. The spongy tissue at the ends of long bones is designed to absorb shock and distribute loads during activities such as walking or running. Additionally, the spaces within spongy tissue are filled with bone marrow, which is crucial for producing blood cells.

The structure of spongy tissue allows it to provide strength while also optimizing weight, which is essential for the overall mobility and function of the skeletal system. Its location at the extremities also helps facilitate joint movement and contributes to the formation of joints, where flexibility and cushioning are important for smooth motion.