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Hypoxia, characterized by insufficient oxygen supply, leads to a critical decrease in ATP production, the cell's primary energy currency. This energy depletion disrupts essential cellular functions, including the ATP-dependent calcium pump. When the Ca+2 pump fails to maintain normal intracellular calcium concentrations, calcium ions flood the cell, triggering a cascade of damaging biochemical events that can ultimately lead to irreversible cell death. The document highlights specific organs and their vulnerable regions where such hypoxic-ischemic insults are most likely to occur and be severe. These include the ACA/MCA/PCA boundary areas in the brain, the subendocardium of the left ventricle in the heart, the medulla of the kidney (specifically the straight segment of the proximal tubule and the thick ascending limb), zone III around the central vein in the liver, and the splenic flexure and rectum in the colon. Watershed areas, defined as border zones receiving blood supply from the most distal arterial branches with limited collateral vascularity, are particularly susceptible to ischemia from hypoperfusion. Within the brain, neurons most vulnerable to hypoxic-ischemic insults include Purkinje cells of the cerebellum and pyramidal cells of the hippocampus and neocortex, categorized visually into zones 3, 5, and 6. The accompanying diagram visually demarcates these susceptible brain regions, illustrating the ACA-MCA and MCA-PCA watershed areas relative to the respective arterial territories.",{"@graph":69,"@context":99},[70,84],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":35,"@type":76,"position":81},"https://docshare.wps.com/document/healthcare/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/reversible-and-irreversible-cellular-injury/24709",{"url":83,"name":65,"@type":85,"author":86,"headline":65,"publisher":89,"fileFormat":92,"description":67,"dateModified":93,"datePublished":93,"encodingFormat":92,"isAccessibleForFree":94,"interactionStatistic":95},"DigitalDocument",{"name":87,"@type":88},"Anda","Person",{"url":74,"name":90,"@type":91},"DocShare","Organization","application/pdf","2026-05-07",true,{"@type":96,"interactionType":97,"userInteractionCount":4},"InteractionCounter",{"@type":98},"ViewAction","https://schema.org",{"og:url":83,"og:type":101,"og:title":65,"og:site_name":90,"og:description":67},"article",{"robots":103,"canonical":83},"index,follow",{"doc_id":105,"site_id":62},24709,1778189605,{"code":4,"msg":5,"data":108},{"doc_id":105,"user_id":109,"nickname":87,"user_avatar":110,"doc_module":4,"category_id":34,"category_name":35,"doc_title":65,"doc_description":67,"doc_content":66,"file_id":111,"file_url":112,"file_type":113,"file_size":114,"view_count":4,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":24,"language":115,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":66,"faqs":66,"seo_title":116,"seo_description":67,"update_tm":106,"read_time":117},962075006959,"https://ap-avatar.wpscdn.com/avatar/e0002397efbe92a78e?_k=1776741047341049297","cbCaifkBq0YcLfnb","https://ap.wps.com/l/cbCaifkBq0YcLfnb","pdf",983959,"English","Reversible and Irreversible Cellular Injury | PDF",13]