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 C
Explanation
A. thin skin has five strata
Thin skin has only four strata and lacks the stratum lucidum, which is present only in thick skin (e.g., palms and soles).
B. thin and thick skin have abundant hair follicles
Thick skin lacks hair follicles entirely. Hair is present only in thin skin.
C. thick contains a stratum lucidum, corneum & granulosum
These three layers are prominent in thick skin, providing extra protection in high-friction areas like palms and soles.
D. thick is more widely distributed than thin
Thin skin is more widely distributed over the body. Thick skin is limited to palms and soles.
Correct Answer is B
Explanation
A. apocrine: Apocrine glands release part of their cytoplasm with the secretion, which can include membrane-bound substances like phospholipids.
B. merocrine: Merocrine glands secrete products via exocytosis without releasing any cytoplasm or membrane material. Their secretions do not contain phospholipids.
C. sebaceous: Sebaceous glands are holocrine glands that release the entire cell contents, including membrane lipids such as phospholipids.
D. holocrine: These glands release whole cells that disintegrate, leading to secretions rich in lipids, including phospholipids.
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