Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
a. Bone resorption is triggered by pressure placed on the bone.
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6. Bones & Skeletal Tissue
Microscopic Anatomy of Bones - Bone Cells
2:59 minutesProblem 13
Textbook Question
As we grow, our long bones increase in diameter, but the thickness of the compact bone of the shaft remains relatively constant. Explain this phenomenon.
Verified step by step guidance1
Understand the process of bone growth: Long bones grow in diameter through a process called appositional growth, which involves the addition of new bone tissue to the outer surface of the bone by osteoblasts in the periosteum.
Recognize the role of osteoclasts: While osteoblasts add new bone tissue to the outer surface, osteoclasts in the endosteum (the inner surface of the bone shaft) resorb bone tissue. This ensures that the thickness of the compact bone remains relatively constant as the bone grows in diameter.
Consider the balance between osteoblast and osteoclast activity: The coordinated activity of osteoblasts and osteoclasts ensures that the bone shaft does not become excessively thick or heavy, maintaining structural integrity and functionality.
Relate this phenomenon to bone remodeling: Bone remodeling is a continuous process that adapts the bone structure to mechanical stress and maintains calcium homeostasis. This dynamic process contributes to the balance between bone deposition and resorption during growth.
Connect to the importance of maintaining proportions: The constant thickness of the compact bone ensures that the bone remains strong yet lightweight, allowing for efficient movement and support without compromising its mechanical properties.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Bone Growth and Remodeling
Bone growth occurs through a process called remodeling, where old bone tissue is replaced with new bone tissue. This process is regulated by various factors, including mechanical stress and hormonal influences. As long bones grow in length and diameter, the inner structure adapts to maintain strength while allowing for increased size.
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Compact Bone Structure
Compact bone, also known as cortical bone, is the dense outer layer of bone that provides strength and support. Its thickness remains relatively constant during growth because it is designed to withstand compressive forces. The balance between bone formation and resorption ensures that while the bone diameter increases, the structural integrity is maintained.
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Osteoblasts and Osteoclasts
Osteoblasts are cells responsible for bone formation, while osteoclasts are involved in bone resorption. The activity of these cells is crucial in regulating bone density and structure. During growth, osteoblasts increase bone mass on the outer surface, while osteoclasts help maintain the inner cavity, allowing for an increase in diameter without a significant change in compact bone thickness.
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