{"id":15251,"date":"2024-09-27T08:41:00","date_gmt":"2024-09-27T06:41:00","guid":{"rendered":"https:\/\/adntro.com\/?p=15251"},"modified":"2025-11-10T09:10:39","modified_gmt":"2025-11-10T08:10:39","slug":"respiracion-celular-catabolismo","status":"publish","type":"post","link":"https:\/\/adntro.com\/en\/blog\/learn-genetics\/respiration-cellular-catabolism\/","title":{"rendered":"Cellular respiration - Catabolism"},"content":{"rendered":"<h2 class=\"wp-block-heading\">What is catabolism?<\/h2>\n\n\n\n<p class=\" translation-block\">The <strong>catabolism<\/strong> is a <strong>set of metabolic processes in which large and complex molecules<\/strong> (carbohydrates, lipids\u2026) <strong>are broken down into smaller and simpler molecules<\/strong> (glucose, fatty acids\u2026), <strong>releasing energy<\/strong> in the process. Among the catabolic processes, aerobic cellular respiration stands out as it generates high amounts of energy.<\/p>\n\n\n\n<p>This energy is released in the form of ATP and is used by cells to perform various vital functions, such as growth, tissue repair, muscle contraction, and the maintenance of body temperature.<\/p>\n\n\n\n<p>As the ATP molecules are broken down, energy needed for protein synthesis is released, <a href=\"https:\/\/adntro.com\/en\/blog\/learn-genetics\/what-is-adn\/\">DNA<\/a>, <a href=\"https:\/\/adntro.com\/en\/blog\/genetic-curiosities\/arn-types\/\">RNA<\/a> and other essential macromolecules.<\/p>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\">What is cellular respiration?<\/h2>\n\n\n\n<p class=\" translation-block\">Cellular respiration is a <strong>set of metabolic processes that cells use to convert nutrients<\/strong>, mainly glucose, <strong>into usable energy<\/strong> in the form of adenosine triphosphate (ATP). This process is fundamental for the functioning of cells and, consequently, for living organisms.<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"987\" src=\"https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/respiracion-celular-EN.png\" alt=\"Cellular respiration\" class=\"wp-image-15256\" style=\"width:591px;height:auto\" srcset=\"https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/respiracion-celular-EN.png 2560w, https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/respiracion-celular-EN-300x289.png 300w, https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/respiracion-celular-EN-1024x987.png 1024w, https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/respiracion-celular-EN-768x740.png 768w, https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/respiracion-celular-EN-1536x1481.png 1536w, https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/respiracion-celular-EN-2048x1975.png 2048w, https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/respiracion-celular-EN-12x12.png 12w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\" translation-block\">Cellular respiration can be aerobic or anaerobic. In this article, we will focus on <strong>aerobic cellular respiration<\/strong>, which consists of the following steps:<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ol class=\"wp-block-list\">\n<li class=\" translation-block\"><strong>Glycolysis:<\/strong> degrades glucose into a simpler molecule (pyruvate) which later becomes acetyl-CoA. This molecule is degraded in the Krebs cycle, obtaining large amounts of energy.<\/li>\n\n\n\n<li class=\" translation-block\"><strong>Pyruvate Decarboxylation:<\/strong> each pyruvate molecule is converted into acetyl-CoA, producing CO\u2082 and NADH.<\/li>\n\n\n\n<li class=\" translation-block\"><strong>Krebs Cycle:<\/strong> the set of reactions that form this cycle is crucial in cellular metabolism as it releases highly energetic molecules from acetyl-CoA molecules.<\/li>\n\n\n\n<li class=\" translation-block\"><strong>Electron Transport Chain:<\/strong> the electrons from the molecules generated in the previous step are released, producing high amounts of energy in the form of ATP.<\/li>\n<\/ol>\n\n\n\n<div style=\"height:20px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Glycolysis. The beginning of cellular respiration.<\/h3>\n\n\n\n<p class=\" translation-block\">Glycolysis occurs in the cytoplasm of the cell and consists of the <strong>degradation of glucose<\/strong>, resulting in two <strong>pyruvate molecules<\/strong>, two ATP molecules, and two NADH molecules as final products.<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img decoding=\"async\" width=\"616\" height=\"1024\" src=\"https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/glycolisis.png\" alt=\"Glycolysis - Cellular respiration\" class=\"wp-image-15252\" style=\"width:370px;height:auto\" srcset=\"https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/glycolisis.png 1268w, https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/glycolisis-180x300.png 180w, https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/glycolisis-616x1024.png 616w, https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/glycolisis-768x1277.png 768w, https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/glycolisis-924x1536.png 924w, https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/glycolisis-1232x2048.png 1232w, https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/glycolisis-7x12.png 7w\" sizes=\"(max-width: 616px) 100vw, 616px\" \/><\/figure>\n<\/div>\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>Glycolysis is a central pathway in the <a href=\"https:\/\/adntro.com\/en\/blog\/nutrigenetics\/types-of-metabolism\/\">metabolism<\/a> It provides quick energy in the form of ATP and generates intermediates that can be used in other metabolic pathways, such as the Krebs cycle, thanks to the decarboxylation of pyruvate to acetyl-CoA.<\/p>\n\n\n\n<p class=\" translation-block\">This process consists of <strong>two phases<\/strong>:<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<ol class=\"wp-block-list\">\n<li class=\" translation-block\"><strong>The energy investment phase:<\/strong> in this phase, two ATP molecules are consumed to phosphorylate glucose and convert it into more reactive intermediates.<\/li>\n\n\n\n<li class=\" translation-block\"><strong>The energy generation phase:<\/strong> In this phase, the previously generated molecules are converted into pyruvate, producing two ATP molecules and two NADH molecules.<\/li>\n<\/ol>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\" translation-block\">The general equation is:<br><strong>Glucose + 2NAD<sup>+<\/sup> + 2ADP + 2Pi \u2192 2Pyruvate + 2NADH + 2H<sup>+<\/sup> + 2ATP + 2H<sub>2<\/sub>O<\/strong><\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Pyruvate decarboxylation <\/h3>\n\n\n\n<p class=\" translation-block\">Pyruvate decarboxylation is a crucial metabolic process in which <strong>pyruvate<\/strong>, the final product of glycolysis, is converted <strong>into acetyl-CoA<\/strong>. This process is a <strong>transitional stage that connects<\/strong> glycolysis <strong>with the Krebs cycle<\/strong>.<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full is-resized\"><img decoding=\"async\" width=\"866\" height=\"460\" src=\"https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/pyruvate-oxidation.png\" alt=\"Pyruvate decarboxylation - cellular respiration\" class=\"wp-image-15253\" style=\"width:517px;height:auto\" srcset=\"https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/pyruvate-oxidation.png 866w, https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/pyruvate-oxidation-300x159.png 300w, https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/pyruvate-oxidation-768x408.png 768w, https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/pyruvate-oxidation-18x10.png 18w\" sizes=\"(max-width: 866px) 100vw, 866px\" \/><\/figure>\n<\/div>\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p>This process occurs in the mitochondrial matrix in eukaryotic cells where pyruvate (3-carbon molecule) loses a carboxyl group in the form of carbon dioxide, resulting in the formation of a two-carbon molecule.<\/p>\n\n\n\n<p>The resulting two-carbon molecule is oxidized, and the electrons released in this reaction are transferred to NAD+ to form NADH. The two-carbon molecule, now in the form of an acetyl group, binds to coenzyme A (CoA) to form acetyl-CoA.<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\" translation-block\">General equation:<br><strong>Pyruvate + NAD + CoA \u2192 Acetyl-CoA + CO<sub>2<\/sub> + NADH + H<sup>+<\/sup><\/strong><\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Krebs cycle. Crucial process of cellular respiration<\/h3>\n\n\n\n<p class=\" translation-block\">The Krebs cycle, also known as the citric acid cycle or tricarboxylic acid (TCA) cycle, is a series of chemical reactions that occur in the <strong>mitochondrial matrix of eukaryotic cells<\/strong> and in the cytoplasm of prokaryotes.<\/p>\n\n\n\n<p class=\" translation-block\">It is a <strong>crucial part of cellular metabolism<\/strong> and plays a central role in <strong>energy production<\/strong> through the complete oxidation of acetyl-CoA molecules. This set of reactions releases energy in the form of ATP, NADH, and FADH2 molecules.<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"709\" src=\"https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/krebs-cycle.png\" alt=\"Krebs cycle - cellular respiration\" class=\"wp-image-15254\" style=\"width:706px;height:auto\" srcset=\"https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/krebs-cycle.png 2407w, https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/krebs-cycle-300x208.png 300w, https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/krebs-cycle-1024x709.png 1024w, https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/krebs-cycle-768x532.png 768w, https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/krebs-cycle-1536x1064.png 1536w, https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/krebs-cycle-2048x1418.png 2048w, https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/krebs-cycle-18x12.png 18w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\" translation-block\">Its main function is to produce energy in the form of <strong>ATP and high-energy electrons<\/strong> carried by NADH and FADH2 molecules, which subsequently generate more ATP molecules in the electron transport chain.<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\" translation-block\">General equation:<br><strong>Acetyl-CoA + 3NAD + FAD + GDP + Pi + 2H<sub>2<\/sub>O \u2192 2CO<sub>2<\/sub> + 1GTP + 3NADH + FADH<sub>2<\/sub> + 3H<sup>+<\/sup><\/strong><\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h3 class=\"wp-block-heading\">Electron transport chain <\/h3>\n\n\n\n<p class=\" translation-block\">The electron transport chain (ETC), also known as the <strong>respiratory chain<\/strong>, is the final stage of aerobic cellular respiration and takes place in the <strong>inner membrane of the mitochondria in eukaryotic cells<\/strong>. Its main <strong>function is to produce ATP<\/strong> through oxidative phosphorylation, using the electrons donated by NADH and FADH\u2082, which are generated in glycolysis, pyruvate decarboxylation, and the Krebs cycle.<\/p>\n\n\n\n<p class=\" translation-block\"><strong>The high-energy electrons from NADH and FADH\u2082 are transferred<\/strong> through a series of protein complexes in the inner mitochondrial membrane. The energy released in these steps is used to pump protons (H\u207a) into the intermembrane space, creating a proton gradient. The protons flow back into the mitochondrial matrix through <strong>ATP synthase,<\/strong> driving the synthesis of ATP.<\/p>\n\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-large is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"570\" src=\"https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/electrons-chain.png\" alt=\"Electron transport chain - cellular respiration\" class=\"wp-image-15255\" style=\"width:668px;height:auto\" srcset=\"https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/electrons-chain.png 2106w, https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/electrons-chain-300x167.png 300w, https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/electrons-chain-1024x570.png 1024w, https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/electrons-chain-768x427.png 768w, https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/electrons-chain-1536x855.png 1536w, https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/electrons-chain-2048x1140.png 2048w, https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/electrons-chain-18x10.png 18w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n<\/div>\n\n\n<div style=\"height:10px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\" translation-block\">The general equation is:<br><strong>NADH + H<sup>+<\/sup> + O<sub>2<\/sub> \u2192 NAD + H<sub>2<\/sub>O + 3ATP<br>FADH<sub>2<\/sub> + O<sub>2<\/sub> \u2192 FAD + H<sub>2<\/sub>O + 2ATP<\/strong><\/p>\n\n\n\n<div style=\"height:30px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\" translation-block\"><strong>C<sub>6<\/sub>H<sub>12<\/sub>O<sub>6<\/sub> + 6O<sub>2<\/sub> \u2192 6CO<sub>2<\/sub> + 6H<sub>2<\/sub>O + ATP (36\u221238 molecules)<\/strong><\/p>\n\n\n\n<p><strong>C<sub>6<\/sub>H<sub>12<\/sub>O<sub>6<\/sub>+ 6O<sub>2<\/sub>\u2192 6CO<sub>2<\/sub> + 6H<sub>2<\/sub>O + ATP (36-38 molecules)<\/strong><\/p>","protected":false},"excerpt":{"rendered":"<p>What is catabolism? Catabolism is a set of metabolic processes in which large and complex molecules (carbohydrates, lipids...) are broken down into smaller and simpler molecules (glucose, fatty acids...), releasing energy in the process. Within catabolism, aerobic cellular respiration stands out as it generates large amounts of energy. This energy [...]<\/p>","protected":false},"author":8,"featured_media":15256,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[432],"tags":[42,222,614,216,612,613,616,611,615,610],"class_list":["post-15251","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-aprende-genetica","tag-adntro","tag-atp","tag-cadena-de-transporte-de-electrones","tag-catabolismo","tag-ciclo-de-krebs","tag-descarboxilacion-piruvato","tag-fadh2","tag-glucolisis","tag-nadh","tag-respiracion-celular"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v22.0 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Respiraci\u00f3n celular - catabolismo<\/title>\n<meta name=\"description\" content=\"La respiraci\u00f3n celular es un conjunto de procesos propios del catabolismo que las c\u00e9lulas utilizan para convertir los nutrientes en energ\u00eda\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/adntro.com\/en\/blog\/learn-genetics\/respiration-cellular-catabolism\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Respiraci\u00f3n celular - catabolismo\" \/>\n<meta property=\"og:description\" content=\"La respiraci\u00f3n celular es un conjunto de procesos propios del catabolismo que las c\u00e9lulas utilizan para convertir los nutrientes en energ\u00eda\" \/>\n<meta property=\"og:url\" content=\"https:\/\/adntro.com\/en\/blog\/learn-genetics\/respiration-cellular-catabolism\/\" \/>\n<meta property=\"og:site_name\" content=\"ADNTRO\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/ADNTROSPAIN\/\" \/>\n<meta property=\"article:published_time\" content=\"2024-09-27T06:41:00+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-11-10T08:10:39+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/adntro.com\/wp-content\/uploads\/2024\/07\/respiracion-celular.png\" \/>\n\t<meta property=\"og:image:width\" content=\"2560\" \/>\n\t<meta property=\"og:image:height\" content=\"2468\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Sandra Ferreiro\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@adntrospain\" \/>\n<meta name=\"twitter:site\" content=\"@adntrospain\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Sandra Ferreiro\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/adntro.com\/es\/blog\/aprende-genetica\/respiracion-celular-catabolismo\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/adntro.com\/es\/blog\/aprende-genetica\/respiracion-celular-catabolismo\/\"},\"author\":{\"name\":\"Sandra Ferreiro\",\"@id\":\"https:\/\/adntro.com\/de\/#\/schema\/person\/a71eca38b563da2bb60f24d7e71f7d6b\"},\"headline\":\"Respiraci\u00f3n celular &#8211; 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