Hubs-4-hard – Churner

3 %

Why do we have trabecular bone?

To resist forces from multiple directions

To resist compressive forces

To store minerals for bone resorption

To increase weight of bone

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What happens when bone ECM loses its collagen content?

The bone becomes thicker

The bone becomes brittle

The bone becomes overly flexible

The bone loses its ability to resorb calcium

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At the macroscopic level, where is compact bone primarily located?

Along the outer surface of bones

Within the marrow cavity

At the ends of long bones

Surrounding the trabeculae of cancellous bone

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What component of bone ECM primarily provides resistance to tension?

Osteocytes

Collagen

Hydroxyapatite

Proteoglycans

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What structural feature allows compact bone to resist bending and twisting forces?

The periosteum

The porous nature of trabeculae

The collagen fiber orientation in lamellae

Osteocytes in lacunae

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The ______ is the central part of an osteon, containing ______ and ______ for nutrient and waste transport

Central canal; nerves; canaliculi

Lamellae; calcium; proteoglycans

Central canal; blood vessels; nerves

Lacuna; trabeculae; bone marrow

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Why does bone remodeling continue throughout life?

To produce new osteons in the periosteum

To replace inorganic components of the ECM

To repair microfractures and adapt to mechanical stress

To allow constant growth in bone length

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What is the main difference between osteocytes and osteoblasts?

Osteocytes maintain bone, while osteoblasts create new bone matrix

Osteocytes secrete collagen, while osteoblasts resorb minerals

Osteocytes destroy bone, while osteoblasts form bone

Osteocytes are immature cells, while osteoblasts are mature cells

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Which sequence correctly represents the relationship between bone structures and their functions in resisting forces?

Osteons resist bending forces, trabeculae resist compressive forces, collagen resists tension

Osteons resist bending forces, trabeculae resist multidirectional forces, collagen resists tension

Lamellae resist compressive forces, trabeculae resist tension, hydroxyapatite resists bending forces

Trabeculae resist bending forces, osteons resist compressive forces, hydroxyapatite resists tension

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10.

Which scenario would lead to increased osteoclast activity and what effect would this have on bone structure?

High dietary calcium intake; increased cortical bone thickness

Prolonged immobilization; decreased trabecular density and thinner cortical bone

Post-menopausal estrogen loss; increased trabeculae thickness but decreased cortical strength

Vigorous exercise; alignment of trabeculae along stress lines

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