Question
A 7-year-old boy punctures his thumb with a rusty nail. Four hours later, the thumb appears red and swollen. Initial swelling of the boy’s thumb is primarily due to which of the following mechanisms?
A. |
Decreased intravascular hydrostatic pressure
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B. |
Decreased intravascular oncotic pressure
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C. |
Increased capillary permeability
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D. |
Increased intravascular oncotic pressure
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Show Answer
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Correct Answer � C
Explanation
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Answer :C Increased capillary permeability
Forces that regulate the balance of vascular and tissue fluids include
(1)hydrostatic pressure
(2) oncotic pressure
(3) osmotic pressure,
(4) lymph flow.
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During inflammation, an increase in the permeability of the endothelial cell barrier results in local edema.
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Vasodilation of arterioles exacerbates fluid leakage, and vasoconstriction of postcapillary venules increases the hydrostatic pressure in the capillary bed potentiating the formation of edema.
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Vasodilation of venules decreases capillary hydrostatic pressure and inhibits the movement of fluid into the extravascular spaces.
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Acute inflammation is not associated with changes in plasma oncotic pressure
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