AEMCA Practice Exam

What are osteoblasts responsible for?

1. Breaking down old bone cells

2. Forming new bone tissue

3. Maintaining bone density

4. Connecting bones at the joints

The correct answer is: Forming new bone tissue

Osteoblasts play a crucial role in the process of bone formation. They are specialized cells that are primarily responsible for synthesizing and secreting the components of the bone matrix, which includes collagen and other proteins. This activity is essential for creating new bone tissue, facilitating the growth and repair of bones throughout an individual's life. By producing the organic part of the bone matrix, osteoblasts not only contribute to the formation of new bone but also help in mineralizing the bone structure, thereby increasing its strength and integrity. This process is particularly important during periods of growth, such as in childhood and adolescence, as well as during bone healing after injury. In contrast, the other options represent different functions or components of the skeletal system. While osteoclasts are responsible for breaking down old bone cells, which is essential for the ongoing remodeling of bone, this does not pertain to the direct function of osteoblasts. Maintaining bone density relates more to the balance between the activities of osteoblasts and osteoclasts, rather than a direct function of osteoblasts alone. Lastly, connecting bones at the joints is the role of ligaments and cartilage, not osteoblasts.