{"id":52504,"date":"2019-07-23T19:19:13","date_gmt":"2019-07-23T19:19:13","guid":{"rendered":"https:\/\/www.mometrix.com\/academy\/?page_id=52504"},"modified":"2026-04-27T10:41:16","modified_gmt":"2026-04-27T15:41:16","slug":"muscular-system","status":"publish","type":"page","link":"https:\/\/www.mometrix.com\/academy\/muscular-system\/","title":{"rendered":"Muscular System"},"content":{"rendered":"\n\t\t\t<div id=\"mmDeferVideoEncompass_hgu1Udq2YAQ\" style=\"position: relative;\">\n\t\t\t<picture>\n\t\t\t\t<source srcset=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2023\/01\/circle-play-duotone.webp\" type=\"image\/webp\">\n\t\t\t\t<source srcset=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2023\/01\/circle-play-duotone.png\" type=\"image\/jpeg\"> \n\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" loading=\"eager\" id=\"videoThumbnailImage_hgu1Udq2YAQ\" data-source-videoID=\"hgu1Udq2YAQ\" src=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2023\/01\/circle-play-duotone.png\" alt=\"Muscular System Video\" height=\"464\" width=\"825\" class=\"size-full\" data-matomo-title = \"Muscular System\">\n\t\t\t<\/picture>\n\t\t\t<\/div>\n\t\t\t<style>img#videoThumbnailImage_hgu1Udq2YAQ:hover {cursor:pointer;} img#videoThumbnailImage_hgu1Udq2YAQ {background-size:contain;background-image:url(\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2023\/02\/315-muscular-system-1.webp\");}<\/style>\n\t\t\t<script defer>\n\t\t\t  jQuery(\"img#videoThumbnailImage_hgu1Udq2YAQ\").click(function() {\n\t\t\t\tlet videoId = jQuery(this).attr(\"data-source-videoID\");\n\t\t\t\tlet helpTag = '<div id=\"mmDeferVideoYTMessage_hgu1Udq2YAQ\" style=\"display: none;position: absolute;top: -24px;width: 100%;text-align: center;\"><span style=\"font-style: italic;font-size: small;border-top: 1px solid #fc0;\">Having trouble? <a href=\"https:\/\/www.youtube.com\/watch?v='+videoId+'\" target=\"_blank\">Click here to watch on YouTube.<\/a><\/span><\/div>';\n\t\t\t\tlet tag = document.createElement(\"iframe\");\n\t\t\t\ttag.id = \"yt\" + videoId;\n\t\t\t\ttag.src = \"https:\/\/www.youtube-nocookie.com\/embed\/\" + videoId + \"?autoplay=1&controls=1&wmode=opaque&rel=0&egm=0&iv_load_policy=3&hd=0&enablejsapi=1\";\n\t\t\t\ttag.frameborder = 0;\n\t\t\t\ttag.allow = \"autoplay; fullscreen\";\n\t\t\t\ttag.width = this.width;\n\t\t\t\ttag.height = this.height;\n\t\t\t\ttag.setAttribute(\"data-matomo-title\",\"Muscular System\");\n\t\t\t\tjQuery(\"div#mmDeferVideoEncompass_hgu1Udq2YAQ\").html(tag);\n\t\t\t\tjQuery(\"div#mmDeferVideoEncompass_hgu1Udq2YAQ\").prepend(helpTag);\n\t\t\t\tsetTimeout(function(){jQuery(\"div#mmDeferVideoYTMessage_hgu1Udq2YAQ\").css(\"display\", \"block\");}, 2000);\n\t\t\t  });\n\t\t\t  \n\t\t\t<\/script>\n\t\t\n<p><script>\nfunction CER_Function() {\n  var x = document.getElementById(\"CER\");\n  if (x.style.display === \"none\") {\n    x.style.display = \"block\";\n  } else {\n    x.style.display = \"none\";\n  }\n}\n<\/script><\/p>\n<div class=\"moc-toc hide-on-desktop hide-on-tablet\">\n<div><button onclick=\"CER_Function()\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2024\/12\/toc2.svg\" width=\"16\" height=\"16\" alt=\"show or hide table of contents\"><\/button><\/p>\n<p>On this page<\/p>\n<\/div>\n<nav id=\"CER\" style=\"display:none;\">\n<ul>\n<li class=\"toc-h2\"><a href=\"#What_Is_the_Muscular_System\" class=\"smooth-scroll\">What Is the Muscular System?<\/a><\/li>\n<li class=\"toc-h2\"><a href=\"#Skeletal_Muscles\" class=\"smooth-scroll\">Skeletal Muscles<\/a><\/li>\n<li class=\"toc-h2\"><a href=\"#Cardiac_Muscle\" class=\"smooth-scroll\">Cardiac Muscle <\/a><\/li>\n<li class=\"toc-h2\"><a href=\"#Smooth_Muscle\" class=\"smooth-scroll\">Smooth Muscle<\/a><\/li>\n<li class=\"toc-h2\"><a href=\"#Myosin_and_Actin\" class=\"smooth-scroll\">Myosin and Actin<\/a><\/li>\n<li class=\"toc-h2\"><a href=\"#Head_and_Neck_Muscles\" class=\"smooth-scroll\">Head and Neck Muscles<\/a><\/li>\n<li class=\"toc-h2\"><a href=\"#Chest_and_Upper_Back_Muscles\" class=\"smooth-scroll\">Chest and Upper Back Muscles<\/a><\/li>\n<li class=\"toc-h2\"><a href=\"#Abdomen_and_Lower_Back_Muscles\" class=\"smooth-scroll\">Abdomen and Lower Back Muscles<\/a><\/li>\n<li class=\"toc-h2\"><a href=\"#Arm_and_Hand_Muscles\" class=\"smooth-scroll\">Arm and Hand Muscles<\/a><\/li>\n<li class=\"toc-h2\"><a href=\"#Leg_and_Foot_Muscles\" class=\"smooth-scroll\">Leg and Foot Muscles<\/a><\/li>\n<\/ul>\n<\/nav>\n<\/div>\n<div class=\"accordion\"><input id=\"transcript\" type=\"checkbox\" class=\"spoiler_button\" \/><label for=\"transcript\">Transcript<\/label>\n<div class=\"spoiler\" id=\"transcript-spoiler\">\n<p>Hey, guys! Welcome to this Mometrix video about the muscular system.<\/p>\n<p>Muscles aren\u2019t just those things you make when you flex your arms. Muscles go much deeper than that. <\/p>\n<p>Muscles control movement. They help us with our posture. They control a number of voluntary and involuntary movements in our body. <\/p>\n<p>The human body contains roughly 700 muscles that make up half of our body weight. That\u2019s a lot of muscle. So, let\u2019s take a look at the muscular system and the critical roles it plays in our body. <\/p>\n<h2><span id=\"What_Is_the_Muscular_System\" class=\"m-toc-anchor\"><\/span>What Is the Muscular System?<\/h2>\n<p>\nWe have muscles from head to toe. We have muscles in our head and neck, chest and upper back, abdomen and lower back, arms and hands, and legs and feet. They all have muscle, an elastic tissue that controls our movement.<\/p>\n<p>The muscular system consists of skeletal, smooth, and cardiac muscles. Let\u2019s start with the skeletal muscles.<\/p>\n<h2><span id=\"Skeletal_Muscles\" class=\"m-toc-anchor\"><\/span>Skeletal Muscles<\/h2>\n<p>\nWe bend. We lift. We twist and we turn. We can thank the skeletal muscles for that. These muscles, which are the majority of muscle tissue in our body, power our skeletal movement. When you think of movement, you might think of walking or stopping. But skeletal muscles do so much more than that. These muscles help with our posture by holding us upright. <\/p>\n<p>Muscles also keep our skeleton stable. These muscles hold joints in place, so they don\u2019t become dislocated. They also play a crucial role in a number of voluntary movements, like swallowing, that are important to other parts of our body. These voluntary movements result in a push and pull or relax and contract state. Lifting your legs or bending your arm are examples of voluntary movements.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/skeletal-muscle.png\" alt=\"The structure of a skeletal muscle\" width=\"499.9698\" height=\"315.7704\" class=\"aligncenter size-full wp-image-94447\" style=\"box-shadow: 1.5px 1.5px 3px grey\" srcset=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/skeletal-muscle.png 1026w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/skeletal-muscle-300x189.png 300w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/skeletal-muscle-1024x647.png 1024w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/skeletal-muscle-768x485.png 768w\" sizes=\"(max-width: 1026px) 100vw, 1026px\" \/><\/p>\n<p>Since skeletal muscles have their own integrated tissues, they\u2019re actually organs. The tissues, made of microfibers, look as if they have a series of ridges, which makes the muscles striated. <strong>Biceps<\/strong> and <strong>triceps<\/strong> are examples of striated muscles.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/biceps-and-triceps.png\" alt=\"Biceps and triceps are labeled on a diagram of an arm\" width=\"455\" height=\"464\" class=\"aligncenter size-full wp-image-94468\" style=\"box-shadow: 1.5px 1.5px 3px grey\" srcset=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/biceps-and-triceps.png 455w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/biceps-and-triceps-294x300.png 294w\" sizes=\"auto, (max-width: 455px) 100vw, 455px\" \/><\/p>\n<p>There are two types of skeletal muscles, slow-twitch, and fast-twitch. <\/p>\n<h3><span id=\"SlowTwitch_Muscles\" class=\"m-toc-anchor\"><\/span>Slow-Twitch Muscles<\/h3>\n<p>\nSlow-twitch muscles don\u2019t easily tire so they\u2019re best for endurance activities. If you\u2019re going on a long walk or bike, those slow twitch muscles kick in. <\/p>\n<h3><span id=\"FastTwitch_Muscles\" class=\"m-toc-anchor\"><\/span>Fast-Twitch Muscles<\/h3>\n<p>\nWhen you think of a burst of energy, think of a fast-twitch muscle. Since these muscles quickly contract, they\u2019re best used for rapid movements, like if you\u2019re trying to sprint. But the fast-twitch muscles do easily tire.<\/p>\n<h2><span id=\"Cardiac_Muscle\" class=\"m-toc-anchor\"><\/span>Cardiac Muscle <\/h2>\n<p>\nWhile other types of muscles get to rest, the heart muscle doesn\u2019t. It beats every moment of every day for your entire life, pushing blood out of your heart and then relaxing to fill it. Unlike the skeletal muscle, the cardiac muscle is controlled by involuntary movements. <\/p>\n<h2><span id=\"Smooth_Muscle\" class=\"m-toc-anchor\"><\/span>Smooth Muscle<\/h2>\n<p>\nThe smooth muscle doesn\u2019t have the same striation that the skeletal muscle or cardiac muscles have. That\u2019s why these muscles are called smooth. You\u2019ll find these muscles in the walls of hollow organs, acting involuntarily in a number of the body\u2019s activities. <\/p>\n<p>Smooth muscles, for example, contract to push food through the intestines and urine through the bladder. Smooth muscles in the uterus help in the birthing process during contractions. You\u2019ll find smooth muscles around the respiratory, digestive, and reproductive tracts. The <strong>stomach<\/strong> and <strong>lungs<\/strong> are two more examples of smooth muscles.<\/p>\n<h2><span id=\"Myosin_and_Actin\" class=\"m-toc-anchor\"><\/span>Myosin and Actin<\/h2>\n<p>\nMuscle contains two major proteins called myosin and actin. <\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/actin-and-myosin.png\" alt=\"The structure of a skeletal muscle with actin and myosin labeled\" width=\"500.0198\" height=\"287.7321\" class=\"aligncenter size-full wp-image-94480\" style=\"box-shadow: 1.5px 1.5px 3px grey\" srcset=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/actin-and-myosin.png 1246w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/actin-and-myosin-300x173.png 300w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/actin-and-myosin-1024x589.png 1024w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/actin-and-myosin-768x442.png 768w\" sizes=\"(max-width: 1246px) 100vw, 1246px\" \/><\/p>\n<h3><span id=\"Myosin\" class=\"m-toc-anchor\"><\/span>Myosin<\/h3>\n<p>\nMyosin is a thick filament that contains chemical energy that controls a specific movement and plays an important role in muscle contraction. Myosin controls all of the movements you make. If you\u2019re reaching for the remote control, beating an egg in a dish, or turning the pages of a book, that\u2019s myosin at work. Myosin works as the power plant for voluntary or involuntary movements by transferring energy.<\/p>\n<h3><span id=\"Actin\" class=\"m-toc-anchor\"><\/span>Actin<\/h3>\n<p>\nMyosin works with actin, a protein in the thin filament that also plays a role in motion. So how do they work together? When the muscles contract, the thick myosin filaments grabs onto the thin actin filament. Sarcomere is the name of the myofibril unit that contains myosin and actin.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/sarcomere.png\" alt=\"The structure of a skeletal muscle with actin, myosin, and sarcomere labeled\" width=\"500.0198\" height=\"287.7321\" class=\"aligncenter size-full wp-image-94483\" style=\"box-shadow: 1.5px 1.5px 3px grey\" srcset=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/sarcomere.png 1246w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/sarcomere-300x173.png 300w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/sarcomere-1024x589.png 1024w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/sarcomere-768x442.png 768w\" sizes=\"(max-width: 1246px) 100vw, 1246px\" \/><\/p>\n<p>We\u2019ve mentioned that muscle performs a number of important functions. Let\u2019s take a closer look at what they are.<\/p>\n<h2><span id=\"Head_and_Neck_Muscles\" class=\"m-toc-anchor\"><\/span>Head and Neck Muscles<\/h2>\n<p>\nWhen you move your head side to side or up and down, those are the head and neck muscles at work. Not only that, the muscles in our jaw control chewing. Muscles in our neck even help us swallow. Muscles in our face help us smile. Face muscles are also unique because most of them connect bones to skin. In other parts of the body, muscles generally connect to and move bone.<\/p>\n<h2><span id=\"Chest_and_Upper_Back_Muscles\" class=\"m-toc-anchor\"><\/span>Chest and Upper Back Muscles<\/h2>\n<p>\nThere are a number of important chest muscles, but none is more important than the <strong>pectoralis major<\/strong>. It helps the shoulder joint move in different directions, giving us the ability to raise our arm or shoot a basketball. The pectoralis major serves an even more important function because these muscles keep our arms attached to our body.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/PEctoralis-major.png\" alt=\"The pectoralis major muscle is labeled on a diagram of the human body\" width=\"499.9911\" height=\"511.0651\" class=\"aligncenter size-full wp-image-94531\" style=\"box-shadow: 1.5px 1.5px 3px grey\" srcset=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/PEctoralis-major.png 903w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/PEctoralis-major-293x300.png 293w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/PEctoralis-major-768x785.png 768w\" sizes=\"(max-width: 903px) 100vw, 903px\" \/><\/p>\n<p>Here\u2019s an easy way to think about the muscles in the chest and upper back. These muscles pretty much control our ability to rotate, whether it\u2019s our head, neck, or trunk. We also wouldn\u2019t be able to hold our head up without the support of these muscles. <\/p>\n<h2><span id=\"Abdomen_and_Lower_Back_Muscles\" class=\"m-toc-anchor\"><\/span>Abdomen and Lower Back Muscles<\/h2>\n<p>\nThe muscles of the abdomen protect vital organs, like the liver, kidneys, and gallbladder.  But these muscles also help the body bend at the waist. This area contains three major muscles.  Anyone who has six-pack abs is looking at their <strong>rectus abdominis<\/strong>, which is located at the front of the body. The rectus abdominis is that layer of muscle underneath fat. When the fat burns away, you\u2019ll see the ridges along your abdomen, or, as they\u2019re commonly called, abs. The <strong>external obliques<\/strong>, located on each side of your body, help our body rotate. <\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/Abdomenal-Muscles.png\" alt=\"An illustration of the muscular system with the abdomen, rectus abdominus, and external obliques labeled.\" width=\"499.9786\" height=\"509.956\" class=\"aligncenter size-full wp-image-94543\" style=\"box-shadow: 1.5px 1.5px 3px grey\" srcset=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/Abdomenal-Muscles.png 902w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/Abdomenal-Muscles-294x300.png 294w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/Abdomenal-Muscles-768x783.png 768w\" sizes=\"(max-width: 902px) 100vw, 902px\" \/><\/p>\n<p>Lastly, the <strong>latissimus dorsi<\/strong> muscle, located in the middle of the back, plays a critical role in extending and rotating the arm. <\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/Latissimus-Dorsi.png\" alt=\"An illustration of the muscular system, viewed from the back, with the latissimus dorsi labeled in the lower right.\" width=\"500.0214\" height=\"511.6113\" class=\"aligncenter size-full wp-image-94546\" style=\"box-shadow: 1.5px 1.5px 3px grey\" srcset=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/Latissimus-Dorsi.png 906w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/Latissimus-Dorsi-293x300.png 293w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/Latissimus-Dorsi-768x786.png 768w\" sizes=\"(max-width: 906px) 100vw, 906px\" \/><\/p>\n<h2><span id=\"Arm_and_Hand_Muscles\" class=\"m-toc-anchor\"><\/span>Arm and Hand Muscles<\/h2>\n<p>\nWe all know the importance of our arms and hands. The muscles here help us do everything from typing to writing to painting. The muscles help with the strength and the ability to lift a frying pan, engage in physical activity, and squeeze. Three muscles\u2014the <strong>brachialis<\/strong>, <strong>biceps brachii<\/strong>, and the <strong>brachioradialis<\/strong>\u2014work together so that we can flex and extend our upper arms.<\/p>\n<p>The wrist, hands, and fingers, by in large, don\u2019t move muscles on their own. Forearm muscles, like the <strong>flexor carpi radialis<\/strong> and <strong>flexor digitorum superficialis<\/strong>, control the flexing movement. These flexor muscles control the ability for the joint to bend. <\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/Forearm-Muscles.png\" alt=\"An illustration of the forearm muscles, with the flexor carpi radialis and the flexor digitorum superficialis labeled.\" width=\"499.9584\" height=\"505.9886\" class=\"aligncenter size-full wp-image-94558\" style=\"box-shadow: 1.5px 1.5px 3px grey\" srcset=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/Forearm-Muscles.png 912w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/Forearm-Muscles-296x300.png 296w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/Forearm-Muscles-768x777.png 768w\" sizes=\"(max-width: 912px) 100vw, 912px\" \/><\/p>\n<p>Other muscles, called <strong>extensors<\/strong>, control the ability to open the joint.<\/p>\n<h2><span id=\"Leg_and_Foot_Muscles\" class=\"m-toc-anchor\"><\/span>Leg and Foot Muscles<\/h2>\n<p>\nIf you want to run or jump or just maintain your balance, you need the muscle in your legs and feet. Think of all the movement centered in this region of the body. The muscles stretch, contract, relax, and stabilize rotate joints. These leg muscles are called long muscles because they stretch. <\/p>\n<p>The <strong>quadriceps<\/strong>, located in the front of the thigh, are the leanest and strongest muscles in the body. The <strong>hamstrings<\/strong> are on the back of the thigh, and anyone who has ever pulled a hammy knows exactly how painful that is. <strong>Calf muscles<\/strong> connect to the heel, making it a pivotal part of moving the foot, ankle, and knee.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/Leg-Muscles.png\" alt=\"An illustration of the leg muscles, with the quadriceps, hamstrings, and calf muscles labeled\" width=\"500.0409\" height=\"506.092\" class=\"aligncenter size-full wp-image-94570\" style=\"box-shadow: 1.5px 1.5px 3px grey\" srcset=\"https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/Leg-Muscles.png 909w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/Leg-Muscles-296x300.png 296w, https:\/\/www.mometrix.com\/academy\/wp-content\/uploads\/2021\/09\/Leg-Muscles-768x777.png 768w\" sizes=\"(max-width: 909px) 100vw, 909px\" \/><\/p>\n<p>So that\u2019s our overview of the muscular system, the system that gives us flexibility and provides the structure for movement and strength. I hope that this overview was helpful for you!<\/p>\n<p>See you guys next time!<\/p>\n<ul class=\"citelist\">\n<li><a href=\"https:\/\/www.innerbody.com\/image\/musfov.html\"target=\"_blank\">Taylor, Tim. 2020. \u201cMuscular System &#8211; Muscles of the Human Body.\u201d InnerBody<\/a><\/li>\n<li><a href=\"https:\/\/www.healthline.com\/human-body-maps\/muscular-system#1\"target=\"_blank\"> \u201cMuscular System Anatomy, Diagram &#038; Function | Healthline.\u201d Healthline. 2018<\/a><\/li>\n<li><a href=\"https:\/\/pdb101.rcsb.org\/motm\/18\"target=\"_blank\">\u201cPDB101: Molecule of the Month: Myosin.\u201d n.d.<\/a><\/li>\n<li><a href=\"https:\/\/www.healthline.com\/human-body-maps\/external-oblique-muscle#1\"target=\"_blank\">\u201cExternal Oblique.\u201d 2014. Healthline<\/a><\/li>\n<li><a href=\"https:\/\/www.healthline.com\/human-body-maps\/chest-muscles#1\"target=\"_blank\">\u201cChest Muscles Anatomy, Diagram &#038; Function | Body Maps.\u201d 2018. Healthline<\/a><\/li>\n<\/ul>\n<\/div>\n<\/div>\n\n<div class=\"home-buttons\">\n<p><a href=\"https:\/\/www.mometrix.com\/academy\/biology\/\">Return to Biology Videos<\/a><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Return to Biology Videos<\/p>\n","protected":false},"author":1,"featured_media":91447,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":{"0":"post-52504","1":"page","2":"type-page","3":"status-publish","4":"has-post-thumbnail","6":"page_category-anatomy-and-physiology-videos","7":"page_type-video","8":"subject_matter-science"},"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.mometrix.com\/academy\/wp-json\/wp\/v2\/pages\/52504","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.mometrix.com\/academy\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/www.mometrix.com\/academy\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/www.mometrix.com\/academy\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.mometrix.com\/academy\/wp-json\/wp\/v2\/comments?post=52504"}],"version-history":[{"count":5,"href":"https:\/\/www.mometrix.com\/academy\/wp-json\/wp\/v2\/pages\/52504\/revisions"}],"predecessor-version":[{"id":292409,"href":"https:\/\/www.mometrix.com\/academy\/wp-json\/wp\/v2\/pages\/52504\/revisions\/292409"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.mometrix.com\/academy\/wp-json\/wp\/v2\/media\/91447"}],"wp:attachment":[{"href":"https:\/\/www.mometrix.com\/academy\/wp-json\/wp\/v2\/media?parent=52504"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}