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← Human Body & HealthWhich outcome occurs when complement C5a over-activates endothelial cells?
A)Capillary permeability temporarily increases✓
B)Infected cells undergo apoptosis directly
C)T-cell-mediated immunity temporarily blocked
D)B-cell class switching permanently impaired
💡 Explanation
Increased capillary dilation follows because complement anaphylatoxins like C5a trigger increased vascular permeability. Therefore capillaries temporarily become leaky, rather than targetting infected apoptotic cells, because T or B cells have different functional mechanisms.
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