{"id":147711,"date":"2022-03-20T05:02:39","date_gmt":"2022-03-19T23:32:39","guid":{"rendered":"https:\/\/infinitylearn.com\/surge\/parasympathetic-nervous-system-function-examples-and-faqs\/"},"modified":"2022-04-14T13:20:37","modified_gmt":"2022-04-14T07:50:37","slug":"parasympathetic-nervous-system-function-examples-and-faqs","status":"publish","type":"post","link":"https:\/\/infinitylearn.com\/surge\/biology\/parasympathetic-nervous-system\/","title":{"rendered":"Parasympathetic Nervous System &#8211; Function, Examples and FAQs"},"content":{"rendered":"<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_37 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\">Table of Contents<\/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\" style=\"display: none;\"><label for=\"item\" aria-label=\"Table of Content\"><span style=\"display: flex;align-items: center;width: 35px;height: 30px;justify-content: center;\"><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><\/label><input type=\"checkbox\" id=\"item\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' style='display:block'><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/infinitylearn.com\/surge\/biology\/parasympathetic-nervous-system\/#What_is_the_Parasympathetic_Nervous_System\" title=\"What is the Parasympathetic Nervous System?\">What is the Parasympathetic Nervous System?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/infinitylearn.com\/surge\/biology\/parasympathetic-nervous-system\/#Parasympathetic_Nervous_System_Function\" title=\"Parasympathetic Nervous System Function\">Parasympathetic Nervous System Function<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/infinitylearn.com\/surge\/biology\/parasympathetic-nervous-system\/#Parasympathetic_Nerves\" title=\"Parasympathetic Nerves\">Parasympathetic Nerves<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/infinitylearn.com\/surge\/biology\/parasympathetic-nervous-system\/#Major_Cranial_Nerves\" title=\"Major Cranial Nerves\">Major Cranial Nerves<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/infinitylearn.com\/surge\/biology\/parasympathetic-nervous-system\/#Parasympathetic_Stimulation_-_The_Parasympathetic_Nervous_System_and_the_Vagus_Nerve\" title=\"Parasympathetic Stimulation &#8211; The Parasympathetic Nervous System and the Vagus Nerve\">Parasympathetic Stimulation &#8211; The Parasympathetic Nervous System and the Vagus Nerve<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/infinitylearn.com\/surge\/biology\/parasympathetic-nervous-system\/#Examples_of_Parasympathetic_Activity_and_Responses\" title=\"Examples of Parasympathetic Activity and Responses\">Examples of Parasympathetic Activity and Responses<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/infinitylearn.com\/surge\/biology\/parasympathetic-nervous-system\/#Parasympathetic_Fibers\" title=\"Parasympathetic Fibers\">Parasympathetic Fibers<\/a><\/li><\/ul><\/nav><\/div>\n<h2><span class=\"ez-toc-section\" id=\"What_is_the_Parasympathetic_Nervous_System\"><\/span>What is the Parasympathetic Nervous System?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The Parasympathetic Nervous System is a division of the autonomic nervous system that is responsible for slowing the heart rate, constricting the pupils, and stimulating digestion. It is also responsible for returning the body to a state of rest and relaxation after a state of arousal. The Parasympathetic Nervous System is activated by the release of the neurotransmitter acetylcholine.<\/p>\n<p><img loading=\"lazy\" class=\"aligncenter wp-image-147710 size-full\" src=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2022\/03\/parasympathetic-nervous-system-function-examples-and-faqs.jpg\" alt=\"\" width=\"606\" height=\"428\" srcset=\"https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2022\/03\/parasympathetic-nervous-system-function-examples-and-faqs.jpg?v=1647732754 606w, https:\/\/infinitylearn.com\/surge\/wp-content\/uploads\/2022\/03\/parasympathetic-nervous-system-function-examples-and-faqs-300x212.jpg?v=1647732754 300w\" sizes=\"(max-width: 606px) 100vw, 606px\" \/><\/p>\n<h2><span class=\"ez-toc-section\" id=\"Parasympathetic_Nervous_System_Function\"><\/span>Parasympathetic Nervous System Function<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The parasympathetic nervous system (PNS) is one half of the autonomic nervous system (ANS), the other half being the sympathetic nervous system. The autonomic nervous system controls all of the body&#8217;s involuntary functions, including heart rate, digestion, and breathing.<\/p>\n<p>The parasympathetic nervous system is responsible for slowing the heart rate, constricting the pupils, and increasing the production of saliva and digestive juices. It also promotes relaxation and rest.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Parasympathetic_Nerves\"><\/span>Parasympathetic Nerves<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The parasympathetic nervous system is responsible for controlling the body&#8217;s &#8220;rest and digest&#8221; activities. This system stimulates the digestive system, slows the heart rate, and increases blood flow to the digestive organs. The parasympathetic nervous system is also responsible for sexual arousal and orgasm.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Major_Cranial_Nerves\"><\/span>Major Cranial Nerves<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>I. Olfactory Nerve<\/p>\n<p>The olfactory nerve is the first cranial nerve and arises from the olfactory bulb in the front of the brain. It carries signals from the nose to the brain about smells.<\/p>\n<p>II. Optic Nerve<\/p>\n<p>The optic nerve is the second cranial nerve and arises from the optic chiasm in the middle of the brain. It carries signals from the eyes to the brain about what is being seen.<\/p>\n<p>III. Oculomotor Nerve<\/p>\n<p>The oculomotor nerve is the third cranial nerve and arises from the brainstem. It controls the muscles that move the eyes up, down, and sideways, and the muscles that control pupil size.<\/p>\n<p>IV. Trochlear Nerve<\/p>\n<p>The trochlear nerve is the fourth cranial nerve and arises from the brainstem. It controls the muscle that moves the eyeball up and down.<\/p>\n<p>V. Trigeminal Nerve<\/p>\n<p>The trigeminal nerve is the fifth cranial nerve and arises from the brainstem. It controls the muscles of the face and the muscles that open and close the jaw.<\/p>\n<p>VI. Abducens Nerve<\/p>\n<p>The abducens nerve is the sixth cranial nerve and arises from the brainstem. It controls the muscle that moves the eyeball sideways.<\/p>\n<p>VII. Facial Nerve<\/p>\n<p>The facial nerve is the seventh cranial nerve and<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Parasympathetic_Stimulation_-_The_Parasympathetic_Nervous_System_and_the_Vagus_Nerve\"><\/span>Parasympathetic Stimulation &#8211; The Parasympathetic Nervous System and the Vagus Nerve<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The Parasympathetic Nervous System (PSNS) is responsible for slowing the heart rate, reducing the contractions of the smooth muscles in the gut, and increasing the production of digestive juices. The PSNS is also responsible for stimulating urination and sexual arousal. The primary nerve of the PSNS is the vagus nerve. The vagus nerve originates in the brainstem and extends down through the chest and abdomen. The vagus nerve controls the activity of most of the organs in the body that are not under conscious control, such as the heart, stomach, and intestines. The vagus nerve also helps to control the release of stress hormones from the brain.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Examples_of_Parasympathetic_Activity_and_Responses\"><\/span>Examples of Parasympathetic Activity and Responses<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Parasympathetic activity is responsible for slowing the heart rate, constricting the pupil, and increasing digestive secretions. Some common responses to parasympathetic activity include a decrease in heart rate, pupil constriction, and increased digestive secretions.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Parasympathetic_Fibers\"><\/span>Parasympathetic Fibers<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>The parasympathetic fibers originate from the sacral plexus, which is located in the pelvis. The fibers travel through the pelvic cavity to the lumbar plexus, which is located in the lower back. The fibers then travel up the spinal cord to the brain. The parasympathetic fibers are responsible for the following functions:<\/p>\n<p>-Regulating the heart rate<br \/>\n-Slowing the heart rate<br \/>\n-Increasing the heart rate<br \/>\n-Regulating the digestive system<br \/>\n-Stimulating salivation<br \/>\n-Stimulating the production of digestive juices<br \/>\n-Stimulating the bladder and bowel function<br \/>\n-Stimulating the sexual function<\/p>\n","protected":false},"excerpt":{"rendered":"<p>What is the Parasympathetic Nervous System? The Parasympathetic Nervous System is a division of the autonomic nervous system that is [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_focuskw":"Parasympathetic Nervous System - Function, Examples and FAQs","_yoast_wpseo_title":"","_yoast_wpseo_metadesc":"Learn about parasympathetic nervous system topic of Biology in details explained by subject experts on infinitylearn.com. 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