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The immature bone found in the fetus and during bone repair is:

A.

spongy bone

B.

woven bone

C.

lamellar bone

D.

cancellous bone

E.

compact bone

Answer and Explanation

The Correct Answer is B

A. spongy bone
Spongy bone (aka cancellous bone) is mature bone with a trabecular structure, not necessarily immature.

B. woven bone
Woven bone is immature bone characterized by random collagen fiber orientation. It is laid down rapidly in fetal development or fracture repair and is later replaced by lamellar bone.

C. lamellar bone
Lamellar bone is mature, organized bone, with parallel collagen fibers. It replaces woven bone during remodeling.

D. cancellous bone
Same as spongy bone-this is not immature bone.

E. compact bone
Compact bone is a mature form of bone found in the diaphysis of long bones, not the initial immature type.


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Related Questions

Correct Answer is A

Explanation

A. hyaluronic acid + proteoglycan monomers: Hyaluronic acid forms the central stalk (handle of the "toilet brush"), and proteoglycan monomers attach along its length, forming a large aggregate that traps water and gives ground substance its gel-like consistency.

B. reticular fibers + collagen fibers: These are structural protein fibers in connective tissue but are not components of proteoglycan aggregates.

C. chondroblasts and chondroclasts: These are cartilage cells involved in formation (chondroblasts) and resorption (chondroclasts) but not part of the ground substance's molecular structure.

D. collagen fibers + fibroblasts: Collagen fibers are structural; fibroblasts produce extracellular matrix components, but neither directly forms the proteoglycan aggregate.

Correct Answer is C

Explanation

A. neutrophils and macrophages are summoned to the area
This is an early step in the inflammatory phase to remove pathogens and debris.

B. blood fills the wound and a clot is formed
This occurs immediately after injury to stop bleeding and initiate repair.

C. granulation tissue is converted into connective tissue
This is part of the remodeling phase-the final stage-where the new tissue is matured and replaced with stronger connective tissue.

D. fibroblasts move in from surrounding connective tissue
This occurs during the proliferative phase, earlier than the final remodeling phase.

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