Which are forms of cellular adaptation?

Which are forms of cellular adaptation?

• A. Necrosis and Apoptosis
• B. Fibrosis and Scarring
• C. Atrophy, Hypertrophy, Hyperplasia, Metaplasia, and Dysplasia
• D. Calcification only

Answer: (C)

Cells adapt to sustained stress in order to preserve function and viability. The forms of cellular adaptation include atrophy (cells shrink in size), hypertrophy (cells enlarge), hyperplasia (increase in the number of cells), metaplasia (one differentiated cell type is replaced by another), and dysplasia (disordered cellular growth with abnormal architecture, often a premalignant change). These changes reflect altered cellular activity in response to demands or injury and are typically reversible if the stress is removed. Necrosis and apoptosis are not adaptations; they are routes of cell death. Fibrosis and scarring involve extracellular matrix remodeling at the tissue level rather than a direct, reversible change within individual cells. Calcification is the deposition of calcium salts, not an adaptive change in cell phenotype.

Cells adapt to sustained stress in order to preserve function and viability. The forms of cellular adaptation include atrophy (cells shrink in size), hypertrophy (cells enlarge), hyperplasia (increase in the number of cells), metaplasia (one differentiated cell type is replaced by another), and dysplasia (disordered cellular growth with abnormal architecture, often a premalignant change). These changes reflect altered cellular activity in response to demands or injury and are typically reversible if the stress is removed.

Necrosis and apoptosis are not adaptations; they are routes of cell death. Fibrosis and scarring involve extracellular matrix remodeling at the tissue level rather than a direct, reversible change within individual cells. Calcification is the deposition of calcium salts, not an adaptive change in cell phenotype.