{"id":205625,"date":"2025-03-25T06:33:11","date_gmt":"2025-03-25T06:33:11","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=205625"},"modified":"2025-03-25T06:33:13","modified_gmt":"2025-03-25T06:33:13","slug":"at-a-po2-of-100-mm-hg-and-normal-temperature-and-ph","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/03\/25\/at-a-po2-of-100-mm-hg-and-normal-temperature-and-ph\/","title":{"rendered":"At a PO2 of 100 mm Hg and normal temperature and pH"},"content":{"rendered":"\n<p>At a PO2 of 100 mm Hg and normal temperature and pH, hemoglobin is _____percent saturated with oxygen.<\/p>\n\n\n\n<p><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-6-color\"><strong>The correct answer and explanation is :<\/strong><\/mark><\/p>\n\n\n\n<p>At a <strong>PO\u2082 of 100 mm Hg<\/strong>, <strong>hemoglobin is approximately 98% saturated<\/strong> with oxygen.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Explanation:<\/strong><\/h3>\n\n\n\n<p>Hemoglobin\u2019s oxygen saturation is determined by the oxygen-hemoglobin dissociation curve, which describes how readily hemoglobin binds and releases oxygen under varying partial pressures of oxygen (PO\u2082). The curve has a characteristic <strong>sigmoidal (S-shaped) shape<\/strong> due to cooperative binding\u2014when one oxygen molecule binds, hemoglobin\u2019s affinity for additional oxygen molecules increases.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Key Factors at PO\u2082 of 100 mm Hg:<\/strong><\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Oxygen Binding in the Lungs:<\/strong>\n<ul class=\"wp-block-list\">\n<li>In normal physiological conditions, arterial blood has a PO\u2082 of about <strong>100 mm Hg<\/strong>, which occurs in the pulmonary capillaries of the lungs.<\/li>\n\n\n\n<li>At this PO\u2082, hemoglobin is <strong>almost fully saturated<\/strong>, at around <strong>98%<\/strong>. This means nearly all hemoglobin molecules are carrying the maximum four oxygen molecules.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Oxygen Transport to Tissues:<\/strong>\n<ul class=\"wp-block-list\">\n<li>As blood circulates and reaches tissues, the PO\u2082 decreases. At <strong>40 mm Hg<\/strong> (the typical PO\u2082 in resting tissues), hemoglobin saturation drops to <strong>about 75%<\/strong>, allowing oxygen release.<\/li>\n\n\n\n<li>In active tissues (e.g., exercising muscles), the PO\u2082 can drop below <strong>20 mm Hg<\/strong>, facilitating even more oxygen unloading.<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Influence of Temperature, pH, and CO\u2082:<\/strong>\n<ul class=\"wp-block-list\">\n<li>The given conditions assume <strong>normal body temperature (37\u00b0C) and pH (7.4)<\/strong>.<\/li>\n\n\n\n<li>A drop in pH or an increase in temperature shifts the curve <strong>rightward<\/strong> (Bohr effect), enhancing oxygen unloading to tissues.<\/li>\n\n\n\n<li>A higher pH or lower temperature shifts it <strong>leftward<\/strong>, making hemoglobin hold onto oxygen more tightly.<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<p>Thus, at a PO\u2082 of <strong>100 mm Hg<\/strong>, hemoglobin is approximately <strong>98% saturated<\/strong>, ensuring efficient oxygen delivery throughout the body.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<p>Here\u2019s an image illustrating the <strong>oxygen-hemoglobin dissociation curve<\/strong> and how saturation varies with PO\u2082.<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/learnexams.com\/blog\/wp-content\/uploads\/2025\/03\/image-1367.png\" alt=\"\" class=\"wp-image-205626\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>At a PO2 of 100 mm Hg and normal temperature and pH, hemoglobin is _____percent saturated with oxygen. The correct answer and explanation is : At a PO\u2082 of 100 mm Hg, hemoglobin is approximately 98% saturated with oxygen. Explanation: Hemoglobin\u2019s oxygen saturation is determined by the oxygen-hemoglobin dissociation curve, which describes how readily hemoglobin [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-205625","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/205625","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=205625"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/205625\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=205625"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=205625"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=205625"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}