Infarcts rarely occur in______________?
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Answer: D. Both A and B
Explanation
Both the liver and lungs receive blood from multiple independent vascular sources, providing protective collateral circulation. If one blood vessel becomes obstructed, alternative pathways maintain adequate tissue perfusion and prevent ischemic necrosis. This dual blood supply makes these vital organs exceptionally resistant to developing classic ischemic tissue infarctions. An infarction is an area of ischemic necrosis caused by compromised blood supply in affected organ tissues. Organs supplied by a single end-artery lack collateral pathways and are highly susceptible to sudden vascular occlusion. The hepatic circulation involves both the hepatic artery and the portal vein supplying functional liver tissue.
Liver tissue possesses a dual blood supply and rarely develops classic infarctions following solitary vascular blockages. Lung tissue is similarly protected by dual circulations, preventing standard ischemic infarction during most minor vessel occlusions. Since both listed organs are resistant, the combined option is the only correct answer for this question.
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