{"id":191641,"date":"2025-02-15T09:35:30","date_gmt":"2025-02-15T09:35:30","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=191641"},"modified":"2025-02-15T09:35:32","modified_gmt":"2025-02-15T09:35:32","slug":"nephrons","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/02\/15\/nephrons\/","title":{"rendered":"Nephrons"},"content":{"rendered":"\n<p>Nephrons<br>a. Nephron structure<br>(1) A nephron is the functional unit of the kidney.<br>(2) It consists of a renal corpuscle and a renal tubule.<br>(a) The corpuscle consists of a glomerulus and a glomerular capsule.<br>(b) Segments of the renal tubule include the proximal convoluted tubule, nephron loop (descending and ascending limbs), and distal convoluted tubule, which empties into a collecting duct.<br>(3) The collecting duct (technically not part of a nephron) empties into the minor calyx of the renal pelvis.<\/p>\n\n\n\n<p>b. Blood supply of a nephron<br>(1) The glomerular capillary receives blood from the afferent arteriole and passes it to the efferent arteriole.<br>(2) The efferent arteriole gives rise to theperitubular capillary system, which<br>surrounds the renal tubule.<br>c. Juxtaglomerular apparatus<br>(1) The juxtaglomerular apparatus is at the point of contact between the last portion of the ascending limb of the nephron loop and the afferent and efferent arterioles.<br>(2) It consists of the macula densa and juxtaglomerular cells.<\/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<h3 class=\"wp-block-heading\">Nephrons: Structure and Function<\/h3>\n\n\n\n<p><strong>a. Nephron Structure<\/strong><br>A nephron is the functional unit of the kidney responsible for filtering blood, reabsorbing water and nutrients, and excreting waste products as urine. It consists of two main parts: the <strong>renal corpuscle<\/strong> and the <strong>renal tubule<\/strong>.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Renal Corpuscle<\/strong><br>The renal corpuscle consists of the <strong>glomerulus<\/strong>, a network of capillaries where blood filtration occurs, and the <strong>glomerular capsule<\/strong> (also known as Bowman&#8217;s capsule), which encases the glomerulus and collects the filtered fluid.<\/li>\n\n\n\n<li><strong>Renal Tubule<\/strong><br>The renal tubule is divided into several segments:<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Proximal Convoluted Tubule (PCT)<\/strong>: This is where the majority of reabsorption occurs, including nutrients like glucose, amino acids, and electrolytes.<\/li>\n\n\n\n<li><strong>Nephron Loop<\/strong> (also called the loop of Henle): This consists of a <strong>descending limb<\/strong> (where water is reabsorbed) and an <strong>ascending limb<\/strong> (where sodium and chloride ions are reabsorbed).<\/li>\n\n\n\n<li><strong>Distal Convoluted Tubule (DCT)<\/strong>: This part fine-tunes the reabsorption process, particularly with respect to electrolytes and acid-base balance.<\/li>\n\n\n\n<li>The tubule then empties into a <strong>collecting duct<\/strong>, which is not technically part of the nephron but is involved in the final adjustments to urine composition.<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Collecting Duct<\/strong><br>The collecting duct carries urine from multiple nephrons and empties into the minor calyx of the renal pelvis, where it eventually moves into the ureter for excretion.<\/li>\n<\/ol>\n\n\n\n<p><strong>b. Blood Supply of a Nephron<\/strong><br>Blood enters the nephron through the <strong>afferent arteriole<\/strong>, which supplies the glomerulus. After filtration, the blood exits via the <strong>efferent arteriole<\/strong> and enters the <strong>peritubular capillary system<\/strong>, which surrounds the renal tubule and facilitates the exchange of gases, nutrients, and waste products.<\/p>\n\n\n\n<p><strong>c. Juxtaglomerular Apparatus<\/strong><br>The juxtaglomerular apparatus (JGA) is located where the ascending limb of the nephron loop contacts the afferent and efferent arterioles. It plays a role in regulating blood pressure and filtration rate. It consists of:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Macula Densa<\/strong>: Cells in the DCT that sense the concentration of sodium chloride and signal the afferent arteriole to adjust blood flow accordingly.<\/li>\n\n\n\n<li><strong>Juxtaglomerular Cells<\/strong>: Specialized smooth muscle cells in the afferent arteriole that secrete renin, which helps regulate blood pressure and fluid balance.<\/li>\n<\/ul>\n\n\n\n<p>I\u2019ll generate an image to help visualize the structure of the nephron and its components.<\/p>\n\n\n\n<p>Here is a detailed diagram of a nephron, showing all the key structures and their relationships, including the renal corpuscle, renal tubule segments, blood supply, and the juxtaglomerular apparatus. Let me know if you&#8217;d like further details or explanations!<\/p>\n\n\n\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/learnexams.com\/blog\/wp-content\/uploads\/2025\/02\/image-614.png\" alt=\"\" class=\"wp-image-191642\"\/><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Nephronsa. Nephron structure(1) A nephron is the functional unit of the kidney.(2) It consists of a renal corpuscle and a renal tubule.(a) The corpuscle consists of a glomerulus and a glomerular capsule.(b) Segments of the renal tubule include the proximal convoluted tubule, nephron loop (descending and ascending limbs), and distal convoluted tubule, which empties into [&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-191641","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/191641","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=191641"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/191641\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=191641"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=191641"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=191641"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}