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Questions and Answers
What is the primary effect of increased physical stress on bone according to Wolff's Law?
What is the primary effect of increased physical stress on bone according to Wolff's Law?
- Bone loses density
- Bone growth is inhibited
- Bone gains bony matrix (correct)
- Bone becomes brittle
What happens to bone when there is decreased physical stress according to Wolff's Law?
What happens to bone when there is decreased physical stress according to Wolff's Law?
- Bone loses bony matrix (correct)
- Bone structure remains unchanged
- Bone increases in density
- Calcium is withdrawn from the bone
What is described as a result of pressure placed upon a tissue?
What is described as a result of pressure placed upon a tissue?
- Bone fractures easily
- Bone becomes spongy
- An electric charge is generated (correct)
- Growth of muscle is stimulated
How does excessive stress affect calcium deposition in bones?
How does excessive stress affect calcium deposition in bones?
What role does the piezo-electric effect play in bone health?
What role does the piezo-electric effect play in bone health?
What component is laid down in bone in response to stress?
What component is laid down in bone in response to stress?
Flashcards
Wolff's Law
Wolff's Law
Bone grows and strengthens in response to the stress placed upon it.
Bone response to stress
Bone response to stress
Increased stress leads to bone growth; decreased stress leads to bone loss.
Bone Composition
Bone Composition
Bone is primarily made of calcium, but there are other components.
Piezoelectric Effect
Piezoelectric Effect
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Calcium Deposition
Calcium Deposition
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Bone's response to load
Bone's response to load
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Study Notes
Wolff's Law
- Wolff's Law describes how bone structure adapts to the forces acting on it.
- Increased physical stress on a bone leads to bone growth and increased bone density (gaining bony matrix).
- Decreased physical stress on a bone leads to bone loss and reduced density (losing bony matrix).
Bone Structure
- A long bone is composed of different parts:
- Epiphysis: Ends of the bone
- Diaphysis: Shaft of the bone
- Articular cartilage: Covers the epiphysis where the bone connects to another bone.
- Epiphyseal line: A remnant of the growth plate or epiphyseal plate.
- Spongy bone: Contains many small spaces, found within the epiphysis and in the interior of the diaphysis.
- Medullary cavity: A hollow region in the diaphysis, filled with yellow bone marrow.
- Nutrient foramina: Openings for blood vessels.
- Endosteum: A thin layer of connective tissue lining the medullary cavity.
- Periosteum: A tough fibrous membrane covering the outer surface of the bone.
Piezo-electric Effect
- Pressure on a tissue creates an electrical charge (piezo-electric effect).
- This slight electric charge in bone tissue stimulates osteoblasts (cells that build bone).
- Osteoclasts (cells that break down bone) are less active in places with a piezo-electric effect.
- This leads to growth and increased bone density.
Excessive Stress
- Excessive stress on bones placed at the joint surface results in calcium deposition.
- This increases bone density and strength in those areas.
- Calcium ions (Ca++) are deposited on the outer edges of the bone, making them denser.
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