Which of the following is not a protein fiber of the matrix?
actin fibers
collagen fibers
reticular fibers
elastic fibers
The Correct Answer is A
A. actin fibers: Actin is a cytoskeletal protein found within cells, not in the extracellular matrix. It supports cell shape and movement but is not part of the matrix fiber system.
B. collagen fibers: These are strong protein fibers found in the extracellular matrix and provide tensile strength.
C. reticular fibers: These are thin, branching fibers composed of collagen and form supportive networks in soft tissues like the spleen and lymph nodes.
D. elastic fibers: Composed of elastin, these fibers provide elasticity to tissues such as skin and blood vessels.
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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
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.
Correct Answer is C
Explanation
A. edema
Edema involves fluid accumulation and can contribute to swelling and immune cell movement, but it does not directly wall off the injury site.
B. vasodilation of blood vessels
Vasodilation increases blood flow to bring immune cells and nutrients, but does not physically isolate the injury.
C. formation of a clot
A blood clot forms a physical barrier that helps prevent the spread of pathogens and walls off the injury.
D. all of the above
While A and B support inflammation and healing, only C directly achieves the goal of physically walling off the injured area. Therefore, "all of the above" is in
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