{"id":5742,"date":"2019-03-13T16:25:01","date_gmt":"2019-03-13T19:25:01","guid":{"rendered":"https:\/\/biologo.com.br\/bio\/?p=5742"},"modified":"2026-03-27T12:46:21","modified_gmt":"2026-03-27T15:46:21","slug":"funcionamento-dos-neuronios","status":"publish","type":"post","link":"https:\/\/biologo.com.br\/bio\/funcionamento-dos-neuronios\/","title":{"rendered":"Funcionamento dos neur\u00f4nios"},"content":{"rendered":"\n<p><span style=\"color: #000000; font-size: 14pt;\"><span style=\"color: #3366ff;\"><strong>Funcionamento dos neur\u00f4nios:<\/strong> <\/span>Neur\u00f4nio \u00e9 a c\u00e9lula do sistema nervoso respons\u00e1vel pela condu\u00e7\u00e3o do impulso nervoso. <\/span><\/p>\n\n\n\n<p><span style=\"color: #000000; font-size: 14pt;\">H\u00e1 cerca de 86 bilh\u00f5es de neur\u00f4nios no sistema nervoso humano. Confira como ocorre o funcionamento dessas <a href=\"https:\/\/biologo.com.br\/bio\/documentario-as-celulas\/\">c\u00e9lulas<\/a> especializadas, t\u00e3o importantes para os <a href=\"https:\/\/biologo.com.br\/bio\/dia-mundial-dos-animais\/\">animais<\/a>.<\/span><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span style=\"font-family: 'courier new', courier, monospace; font-size: 18pt; color: #800000;\"><strong>V\u00eddeos did\u00e1ticos:<\/strong><\/span><br><span style=\"font-family: 'courier new', courier, monospace; font-size: 24pt; color: #000000;\"><strong>Funcionamento dos neur\u00f4nios<\/strong><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe loading=\"lazy\" title=\"Os Neur\u00f3nios\" width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/O0fxQNA35mA?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<figure class=\"wp-block-image alignright is-resized\"><a href=\"https:\/\/biologo.com.br\/bio\/o-cerebro\/\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"167\" data-attachment-id=\"2169\" data-permalink=\"https:\/\/biologo.com.br\/bio\/o-cerebro\/o-cerebro-2\/\" data-orig-file=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2017\/03\/O-C%C3%A9rebro.jpg?fit=631%2C351&amp;ssl=1\" data-orig-size=\"631,351\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"O-C\u00e9rebro\" data-image-description=\"&lt;p&gt;Sinapse no C\u00e9rebro. By Allan Ajifo [CC BY 2.0 (http:\/\/creativecommons.org\/licenses\/by\/2.0)], via Wikimedia Commons&lt;\/p&gt;\n\" data-image-caption=\"&lt;p&gt;O C\u00e9rebro&lt;\/p&gt;\n\" data-large-file=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2017\/03\/O-C%C3%A9rebro.jpg?fit=631%2C351&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2017\/03\/O-C%C3%A9rebro.jpg?resize=300%2C167&#038;ssl=1\" alt=\"O C\u00e9rebro\" class=\"wp-image-2169\" style=\"aspect-ratio:1.7965752783755966;width:143px;height:auto\" srcset=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2017\/03\/O-C%C3%A9rebro.jpg?resize=300%2C167&amp;ssl=1 300w, https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2017\/03\/O-C%C3%A9rebro.jpg?w=631&amp;ssl=1 631w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><figcaption class=\"wp-element-caption\"><span style=\"font-size: 10pt; color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/biologo.com.br\/bio\/o-cerebro\/\">O C\u00e9rebro<\/a><\/span><\/figcaption><\/figure>\n\n\n\n<p class=\"has-medium-font-size\"><span style=\"color: #000000;\"><span style=\"font-family: georgia, palatino, serif; font-size: 36pt;\"><strong>O<\/strong> <\/span>neur\u00f4nio \u00e9 uma c\u00e9lula altamente especializada na transmiss\u00e3o de informa\u00e7\u00f5es, na forma de impulsos nervosos. Os impulsos nervosos s\u00e3o <a href=\"https:\/\/pt.wikipedia.org\/wiki\/Eletroqu%C3%ADmica\" target=\"_blank\" rel=\"noopener noreferrer\">fen\u00f4menos eletroqu\u00edmicos<\/a> que utilizam certas propriedades e subst\u00e2ncias da membrana plasm\u00e1tica, que permitem que seja criado e transmitido um impulso el\u00e9trico.<\/span><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><span style=\"font-size: 14pt; color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/biologo.com.br\/bio\/o-cerebro\/\">O C\u00e9rebro<\/a><\/span><\/li>\n\n\n\n<li><span style=\"font-size: 14pt; color: #0000ff;\"><a style=\"color: #0000ff;\" href=\"https:\/\/biologo.com.br\/bio\/citologia\/\">Citologia<\/a><\/span><\/li>\n<\/ul>\n\n\n\n<p class=\"has-medium-font-size\"><span style=\"color: #000000;\">Um neur\u00f4nio em repouso \u00e9 uma c\u00e9lula que possui uma diferen\u00e7a de voltagem entre o seu citoplasma e o l\u00edquido extracelular. Esta diferen\u00e7a de voltagem \u00e9 criada gra\u00e7as ao ac\u00famulo seletivo de \u00edons pot\u00e1ssio (K+) e s\u00f3dio (Na+), que ocorre pela a\u00e7\u00e3o de bombas que criam uma diferen\u00e7a de concentra\u00e7\u00e3o. Esta diferen\u00e7a de concentra\u00e7\u00e3o \u00e9 controlada por canais de K+ e de Na+, gerando uma tens\u00e3o negativa (de -58mV no interior de neur\u00f4nios humanos), que pode variar entre esp\u00e9cies.<\/span><\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter\"><img data-recalc-dims=\"1\" decoding=\"async\" src=\"https:\/\/i0.wp.com\/media2.giphy.com\/media\/2bYewTk7K2No1NvcuK\/200.gif?w=800&#038;ssl=1\" alt=\"The Brain GIFs - Get the best GIF on GIPHY\"\/><\/figure>\n\n\n\n<p><\/p>\n\n\n\n<figure class=\"wp-block-image alignright is-resized\"><a href=\"https:\/\/biologo.com.br\/bio\/o-cerebro\/\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" width=\"288\" height=\"300\" data-attachment-id=\"2170\" data-permalink=\"https:\/\/biologo.com.br\/bio\/o-cerebro\/cerebro-humano\/\" data-orig-file=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2017\/03\/cerebro-humano.jpg?fit=461%2C480&amp;ssl=1\" data-orig-size=\"461,480\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"cerebro-humano\" data-image-description=\"&lt;p&gt;O c\u00e9rebro humano&lt;\/p&gt;\n\" data-image-caption=\"&lt;p&gt;O c\u00e9rebro humano&lt;\/p&gt;\n\" data-large-file=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2017\/03\/cerebro-humano.jpg?fit=461%2C480&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2017\/03\/cerebro-humano.jpg?resize=288%2C300&#038;ssl=1\" alt=\"O c\u00e9rebro humano\" class=\"wp-image-2170\" style=\"aspect-ratio:0.960047921658506;width:167px;height:auto\" srcset=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2017\/03\/cerebro-humano.jpg?resize=288%2C300&amp;ssl=1 288w, https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2017\/03\/cerebro-humano.jpg?w=461&amp;ssl=1 461w\" sizes=\"auto, (max-width: 288px) 100vw, 288px\" \/><\/a><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span style=\"font-family: 'courier new', courier, monospace; color: #000000; font-size: 14pt;\"><strong>Funcionamento dos neur\u00f4nios<\/strong><\/span><\/h3>\n\n\n\n<p class=\"has-medium-font-size\"><span style=\"color: #000000;\">Este estado de equil\u00edbrio (ou estado de polariza\u00e7\u00e3o do neur\u00f4nio) dura at\u00e9 o momento em que um potencial de a\u00e7\u00e3o abre os canais de K+ e de Na+, alterando a concentra\u00e7\u00e3o destes \u00edons. Esta modifica\u00e7\u00e3o gera um potencial positivo dentro do neur\u00f4nio, chegando aos +40mV ou mais (dependendo do organismo estudado). Este desequil\u00edbrio gera um efeito cascata, que \u00e9 o potencial de a\u00e7\u00e3o. Usualmente o potencial de a\u00e7\u00e3o inicia no come\u00e7o no ax\u00f4nio (zona de disparo) e se propaga at\u00e9 as ves\u00edculas sin\u00e1pticas, gerando a descarga de neurotransmissores.<\/span><\/p>\n\n\n\n<p class=\"has-medium-font-size\"><span style=\"color: #000000;\">Ap\u00f3s ter ocorrido o potencial de a\u00e7\u00e3o, imediatamente os canais de K+ e de Na+ come\u00e7am a restabelecer o equil\u00edbrio anterior, com uma tens\u00e3o negativa no interior do neur\u00f4nio e positiva fora dele.<\/span><\/p>\n\n\n\n<p class=\"has-medium-font-size\"><span style=\"color: #000000;\">O neur\u00f4nio precisa, ent\u00e3o, de um brev\u00edssimo tempo para reconstituir seu estado pr\u00e9-descarga, e durante este tempo ele n\u00e3o consegue efetuar outro potencial de a\u00e7\u00e3o. Este per\u00edodo de lat\u00eancia chama-se per\u00edodo refrat\u00e1rio. Logo em seguida, o neur\u00f4nio adquire sua capacidade para efetuar outro potencial de a\u00e7\u00e3o, estabelecendo um ciclo<\/span>.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>Transmiss\u00e3o eficiente da informa\u00e7\u00e3o<\/strong><\/h4>\n\n\n\n<p class=\"has-cm-color-6-color has-text-color has-link-color has-medium-font-size wp-elements-3f36abab3c0e36f3c85f39c2fd5617bf\">Em s\u00edntese, o funcionamento dos neur\u00f4nios revela um sistema extraordinariamente din\u00e2mico e preciso, no qual sinais el\u00e9tricos e qu\u00edmicos se integram de forma cont\u00ednua para garantir a comunica\u00e7\u00e3o no sistema nervoso. O potencial de a\u00e7\u00e3o, portanto, surge como um fen\u00f4meno fundamental, caracterizado por uma r\u00e1pida altera\u00e7\u00e3o do potencial de membrana que se propaga ao longo do ax\u00f4nio sem perda de intensidade, permitindo a transmiss\u00e3o eficiente da informa\u00e7\u00e3o . Al\u00e9m disso, ao atingir as termina\u00e7\u00f5es nervosas, esse impulso desencadeia a libera\u00e7\u00e3o de neurotransmissores nas sinapses, estabelecendo uma ponte funcional entre c\u00e9lulas e modulando respostas excitat\u00f3rias ou inibit\u00f3rias .<\/p>\n\n\n\n<p class=\"has-cm-color-6-color has-text-color has-link-color has-medium-font-size wp-elements-7b36b3e2eef6f45ea516cc5d1d22ba68\">Nesse contexto, a integra\u00e7\u00e3o dos est\u00edmulos recebidos \u2014 sejam eles excitat\u00f3rios ou inibit\u00f3rios \u2014 determina se um novo impulso ser\u00e1 gerado, evidenciando o car\u00e1ter seletivo e adaptativo da atividade neuronal. Assim, longe de atuar de forma isolada, cada neur\u00f4nio participa de uma vasta rede interconectada, na qual bilh\u00f5es de c\u00e9lulas trocam informa\u00e7\u00f5es continuamente, sustentando processos como pensamento, mem\u00f3ria e a\u00e7\u00e3o. Desse modo, compreender o funcionamento dos neur\u00f4nios n\u00e3o apenas ilumina os mecanismos b\u00e1sicos da vida, mas tamb\u00e9m refor\u00e7a a complexidade e a eleg\u00e2ncia do sistema nervoso como um todo.<\/p>\n\n\n\n<h6 class=\"wp-block-heading\"><span style=\"font-size: 10pt;\"><strong><strong style=\"font-family: &quot;courier new&quot;, courier, monospace; font-size: 12pt;\">Fontes e refer\u00eancias:<\/strong><\/strong><\/span><\/h6>\n\n\n\n<ul class=\"wp-block-list\">\n<li class=\"has-black-color has-text-color has-link-color has-small-font-size wp-elements-4dce729a1f310366b653bafbcd008283\">Hall, J. E.; Guyton, A. C. <em><a href=\"https:\/\/shop.elsevier.com\/books\/guyton-and-hall-textbook-of-medical-physiology\/hall\/978-0-323-59712-8\" target=\"_blank\" rel=\"noreferrer noopener\">Textbook of Medical Physiology<\/a><\/em>. Elsevier.<\/li>\n\n\n\n<li class=\"has-black-color has-text-color has-link-color has-small-font-size wp-elements-7e4f7346fc41fb769ca22e820ef1a8f4\">Zhang, J. <em><a href=\"https:\/\/arxiv.org\/abs\/1906.01703\" target=\"_blank\" rel=\"noreferrer noopener\">Basic Neural Units of the Brain: Neurons, Synapses and Action Potential<\/a><\/em><\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image aligncenter is-resized\"><a href=\"https:\/\/biologo.com.br\/bio\/apoie-o-biologo\/\"><img loading=\"lazy\" decoding=\"async\" width=\"174\" height=\"147\" data-attachment-id=\"11979\" data-permalink=\"https:\/\/biologo.com.br\/bio\/caracal-um-mestre-da-sobrevivencia\/apoiepeq\/\" data-orig-file=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2022\/05\/apoiepeq.jpg?fit=174%2C147&amp;ssl=1\" data-orig-size=\"174,147\" data-comments-opened=\"0\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;&quot;,&quot;orientation&quot;:&quot;0&quot;}\" data-image-title=\"apoiepeq\" data-image-description=\"&lt;p&gt;Apoie o Bi\u00f3logo&lt;\/p&gt;\n\" data-image-caption=\"\" data-large-file=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2022\/05\/apoiepeq.jpg?fit=174%2C147&amp;ssl=1\" src=\"https:\/\/i0.wp.com\/biologo.com.br\/bio\/wp-content\/uploads\/2022\/05\/apoiepeq.jpg?resize=174%2C147&amp;ssl=1\" alt=\"Apoie o Bi\u00f3logo\" class=\"wp-image-11979\" style=\"width:156px;height:auto\" title=\"Apoie o Bi\u00f3logo\"\/><\/a><\/figure>\n\n\n\n<p class=\"has-text-align-center\"><a href=\"https:\/\/biologo.com.br\/bio\/apoie-o-biologo\/\">Apoie o Bi\u00f3logo<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Funcionamento dos neur\u00f4nios: Neur\u00f4nio \u00e9 a c\u00e9lula do sistema nervoso respons\u00e1vel pela condu\u00e7\u00e3o do impulso nervoso. H\u00e1 cerca de 86<\/p>\n","protected":false},"author":1,"featured_media":20899,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"video","meta":{"colormag_page_container_layout":"default_layout","colormag_page_sidebar_layout":"default_layout","_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[144,143,6,137,43,126],"tags":[],"class_list":["post-5742","post","type-post","status-publish","format-video","has-post-thumbnail","hentry","category-anatomia","category-biofisica","category-citologia","category-fisiologia","category-neurobiologia","category-videos","post_format-post-format-video"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Funcionamento dos neur\u00f4nios: V\u00eddeos did\u00e1ticos. Neurobiologia - Bi\u00f3logo<\/title>\n<meta name=\"description\" content=\"Neur\u00f4nio \u00e9 a c\u00e9lula do sistema nervoso respons\u00e1vel pela condu\u00e7\u00e3o do impulso nervoso. H\u00e1 cerca de 86 bilh\u00f5es de neur\u00f4nios... Funcionamento dos neur\u00f4nios:\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/biologo.com.br\/bio\/funcionamento-dos-neuronios\/\" \/>\n<meta property=\"og:locale\" content=\"pt_BR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Funcionamento dos neur\u00f4nios: V\u00eddeos did\u00e1ticos. Neurobiologia - Bi\u00f3logo\" \/>\n<meta property=\"og:description\" content=\"Neur\u00f4nio \u00e9 a c\u00e9lula do sistema nervoso respons\u00e1vel pela condu\u00e7\u00e3o do impulso nervoso. H\u00e1 cerca de 86 bilh\u00f5es de neur\u00f4nios... 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