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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Related Questions
Correct Answer is C
Explanation
A. stable; epithelium: Epithelium consists of labile cells, not stable ones. These cells divide frequently even without injury.
B. permanent; nervous: Nervous tissue is considered permanent, and neurons generally do not regenerate or undergo mitosis even after injury.
C. stable; liver: Stable cells do not divide under normal conditions but can be stimulated to divide after injury. Liver cells are a classic example.
D. permanent; liver: In The liver is capable of regeneration and therefore has stable, not permanent, cells.
E. labile; epithelium: This is a true match, but it does not answer the question asked. Labile cells divide regularly and are not "usually non-mitotic" as the question specifies.
Correct Answer is E
Explanation
A. collagen, organic phosphate
This mixes the categories. Collagen is organic, and "organic phosphate" isn’t the correct term for bone mineral content.
B. calcium phosphate compound, osteoblasts and osteocytes
Osteoblasts and osteocytes are cells, not part of the organic matrix. The organic matrix is composed of proteins, primarily collagen.
C. collagen, calcium phosphate compound
This reverses the correct order. Calcium phosphate is inorganic, collagen is organic.
D. collagen, osteoblasts and osteocytes
Again, includes cells instead of matrix materials.
E. calcium phosphate compound, collagen
The inorganic matrix = hydroxyapatite (a calcium phosphate crystal). The organic matrix = collagen fibers, which give tensile strength and flexibility
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