{"id":8094,"date":"2025-10-08T00:02:55","date_gmt":"2025-10-08T08:02:55","guid":{"rendered":"https:\/\/www.osmosis.org\/blog\/?p=8094"},"modified":"2026-03-20T13:54:32","modified_gmt":"2026-03-20T21:54:32","slug":"nclex-question-of-the-day-blood-brain-barrier","status":"publish","type":"post","link":"https:\/\/www.osmosis.org\/blog\/nclex-question-of-the-day-blood-brain-barrier","title":{"rendered":"NCLEX-LPN\u00ae Question of the Day: Blood brain barrier"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_80 ez-toc-wrap-center counter-hierarchy ez-toc-counter ez-toc-custom ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">In This Article<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.osmosis.org\/blog\/nclex-question-of-the-day-blood-brain-barrier\/#The_correct_answer_to_todays_NCLEX-PN%C2%AE_Question_is%E2%80%A6\" >The correct answer to today&#8217;s NCLEX-PN\u00ae Question is&#8230;<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.osmosis.org\/blog\/nclex-question-of-the-day-blood-brain-barrier\/#Main_Takeaway\" >Main Takeaway<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.osmosis.org\/blog\/nclex-question-of-the-day-blood-brain-barrier\/#Incorrect_Answer_Explanations\" >Incorrect Answer Explanations<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.osmosis.org\/blog\/nclex-question-of-the-day-blood-brain-barrier\/#Want_to_learn_more_about_this_topic\" >Want to learn more about this topic?<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n\n<p class=\"wp-block-paragraph\"><strong><em>Today&#8217;s NCLEX-PN\u00ae question of the day focuses on the blood brain barrier. Do you know the answer? Let&#8217;s find out!<\/em><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The nurse has explained the physiology of the blood brain barrier to a nursing student. Which statement indicates an <em>understanding <\/em>of the information?<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>A. \u201cThe blood brain barrier is made up of dendrites that block substances from crossing over to the brain.\u201d<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>B. \u201cThe blood brain barrier is composed of neurons.\u201d<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>C. \u201cThe blood brain barrier is maintained by astrocyte feet, which send signals to maintain tight junctions.\u201d<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>D. \u201cThe blood brain barrier sends signals to block the entrance of certain substances.\u201d<\/strong><\/p>\n\n\n\n<p class=\"has-text-align-center wp-block-paragraph\"><em>Scroll down for the correct answer!<\/em><\/p>\n\n\n\n<figure class=\"wp-block-embed is-type-rich is-provider-embed-handler wp-block-embed-embed-handler wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Nurses Learn by Osmosis.org\" width=\"500\" height=\"281\" src=\"https:\/\/www.youtube.com\/embed\/kGJCkPfFypA?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"The_correct_answer_to_todays_NCLEX-PN%C2%AE_Question_is%E2%80%A6\"><\/span>The correct answer to today&#8217;s NCLEX-PN\u00ae Question is&#8230;<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>C. \u201cThe blood brain barrier is maintained by astrocyte feet, which send signals to maintain tight junctions.\u201d<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Rationale:<\/strong> The blood-brain barrier consists of layers of capillary endothelial cells and a basement membrane. It is maintained by the astrocyte feet, which send \u201csignals\u201d to maintain tight junctions in these areas.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Main_Takeaway\"><\/span>Main Takeaway<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The brain has three main parts. The first is called the cerebrum, which consists of the two cerebral hemispheres: the cerebellum located at the base of the skull and the brainstem, which is located right in front of the cerebellum. The cells that make up the brain are called neurons. Neurons are composed of a cell body containing all the cell\u2019s organelles and nerve fibers extending out from the neuron cell body. These nerve fibers are either dendrites that receive signals from other neurons or axons that send signals to other neurons. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Neurons communicate through neurotransmitters, such as acetylcholine, dopamine, norepinephrine, and glutamate. Three meningeal layers cover the brain that help cushion it and direct venous flow. The blood-brain barrier consists of layers of the capillary endothelial cells and basement membrane. It is maintained by the astrocyte feet, which send \u201csignals\u201d to maintain tight junctions in these areas. This barrier ensures that substances entering the brain are tightly regulated.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Incorrect_Answer_Explanations\"><\/span>Incorrect Answer Explanations<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>A. \u201cThe blood brain barrier is made up of dendrites that block substances from crossing over to the brain.\u201d<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Rationale:<\/strong> Dendrites do not make up the blood brain barrier. Dendrites are responsible for receiving signals from other neurons.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>B. \u201cThe blood brain barrier is composed of neurons.\u201d<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Rationale:<\/strong> Neurons do not make up the blood brain barrier. Neurons are composed of a cell body containing all the cell\u2019s organelles and nerve fibers extending out from the neuron cell body.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>D. \u201cThe blood brain barrier sends signals to block the entrance of certain substances.\u201d<\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Rationale:<\/strong> The blood brain barrier does not send signals to block the entrance of certain substances.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Want_to_learn_more_about_this_topic\"><\/span>Want to learn more about this topic?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><strong>Watch the Osmosis video: <a href=\"https:\/\/www.osmosis.org\/learn\/Blood_brain_barrier\">Blood brain barrier<\/a><\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><a href=\"https:\/\/www.osmosis.org\/create\"><img loading=\"lazy\" decoding=\"async\" width=\"700\" height=\"250\" src=\"https:\/\/www.osmosis.org\/blog\/wp-content\/uploads\/sites\/2\/2025\/01\/Blog_Display_Ads_RN1_2023_535910.png?w=700\" alt=\"\" class=\"wp-image-5083\" srcset=\"https:\/\/www.osmosis.org\/blog\/wp-content\/uploads\/sites\/2\/2025\/01\/Blog_Display_Ads_RN1_2023_535910.png 700w, https:\/\/www.osmosis.org\/blog\/wp-content\/uploads\/sites\/2\/2025\/01\/Blog_Display_Ads_RN1_2023_535910.png?resize=300,107 300w\" sizes=\"auto, (max-width: 700px) 100vw, 700px\" \/><\/a><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><strong><em>Try Osmosis today! Access your\u00a0<a href=\"https:\/\/www.osmosis.org\/create\" target=\"_blank\" rel=\"noreferrer noopener\">free trial<\/a>\u00a0and find out why millions of current and future clinicians and caregivers love learning with us.<\/em><\/strong><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Explore the components and role of the blood-brain barrier in maintaining brain health and protecting the central nervous system.<\/p>\n","protected":false},"author":279,"featured_media":8096,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[20,867,29,1368,1366],"tags":[1651,1653,1656,1652,1081,1621,1654,1657,245,1655],"class_list":["post-8094","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-exam-prep","category-lpn","category-nclex","category-nclex-pn","category-questions","tag-astrocytes","tag-blood-brain-barrier","tag-brain-physiology","tag-cns-protection","tag-nclex-pn","tag-neuroanatomy","tag-neurological-health","tag-nursing-concepts","tag-nursing-education","tag-tight-junctions"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v23.6 - 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