{"page":"\u003clink rel=\"stylesheet\" href=\"https://lessonplanet.com/assets/packs/css/resources-572d6a42.css\" /\u003e\n\u003clink rel=\"stylesheet\" href=\"https://lessonplanet.com/assets/packs/css/lp_boclips_stylesheets-f4d0de30.css\" media=\"all\" /\u003e\n\u003cdiv data-title='Muscles | Physiology | Biology | FuseSchool' data-url='/boclips/videos/625f69b3d7ede60656b5a570' data-video-url='/boclips/videos/625f69b3d7ede60656b5a570' id='bo_player_modal'\u003e\n\u003cdiv class='boclips-resource-page modal-dialog panel-container'\u003e\n\u003cdiv class='react-notifications-root'\u003e\u003c/div\u003e\n\u003cdiv class='rp-header'\u003e\n\u003cdiv class='rp-type'\u003e\n\u003ci aria-hidden='true' class='fai fa-regular fa-circle-play'\u003e\u003c/i\u003e\nVideo\n\u003c/div\u003e\n\u003ch1 class='rp-title' id='video-title'\u003e\nMuscles | Physiology | Biology | FuseSchool\n\u003c/h1\u003e\n\u003cdiv class='rp-actions'\u003e\n\u003cdiv class='mr-1'\u003e\n\u003ca class=\"btn btn-success\" data-posthog-event=\"Signup: LP Signup Activity\" data-posthog-location=\"body_link_boclips\" data-remote=\"true\" href=\"/subscription/new\"\u003e\u003cspan\u003e\u003cspan\u003eGet Free Access\u003c/span\u003e\u003cspan class=\"\"\u003e for 10 Days\u003c/span\u003e\u003cspan\u003e!\u003c/span\u003e\u003c/span\u003e\u003c/a\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003c/div\u003e\n\u003cdiv class='rp-body'\u003e\n\u003cdiv class='rp-info'\u003e\n\u003cdiv aria-label='Hide resource details' class='rp-hide-info' role='button' tabindex='0'\u003e\u0026times;\u003c/div\u003e\n\u003ci aria-label='Expand resource details' class='rp-expand-info fai fa-solid fa-up-right-and-down-left-from-center' role='button' tabindex='0'\u003e\u003c/i\u003e\n\u003ci aria-label='Compress resource details' class='rp-compress-info fai fa-solid fa-down-left-and-up-right-to-center' role='button' tabindex='0'\u003e\u003c/i\u003e\n\u003cdiv class='rp-rating'\u003e\n\u003cspan class='resource-pool'\u003e\n\u003cspan class='pool-label'\u003ePublisher:\u003c/span\u003e\n\u003cspan class='pool-name'\u003e\n\u003cspan class='text'\u003e\u003ca data-publisher-id=\"30356011\" href=\"/search?publisher_ids%5B%5D=30356011\"\u003eCurated Video\u003c/a\u003e\u003c/span\u003e\n\u003c/span\u003e\n\u003c/span\u003e\n\u003c/div\u003e\n\u003cdiv class='rp-description'\u003e\n\u003cspan class='short-description'\u003eMuscles are a very important type of tissue that allow us to perform many functions - from simpler actions such as blinking our eyes and chewing our food, to more complex ones such as swimming and playing football. Muscles are...\u003c/span\u003e\n\u003cspan class='full-description hide'\u003eMuscles are a very important type of tissue that allow us to perform many functions - from simpler actions such as blinking our eyes and chewing our food, to more complex ones such as swimming and playing football. Muscles are essentially bundles of fibres that expand and contract to help make movement possible. These fibres are mostly repeating units of actin and myosin protein chains. If you have larger muscles, it does not mean that you have more fibres - it means that the fibres are just much larger. There are three types of muscles in our body - skeletal, smooth, and cardiac. Skeletal muscles, are suggested in their name, are attached to our skeleton, or bones via tendons. As we control their movement, they are also known as voluntary muscles. Their striped appearance gives them yet another name - striated muscles. These muscles enable us to walk, stop, and lift things up in our arms. There are two types of skeletal muscles - fast twitch and slow twitch. Although fast twitch muscles expand and contract quickly, and are thus responsible for powerful movements, they become tired very quickly. If you jump very quickly into the air, you probably can only do it a few times before feeling exhausted! On the other hand, slow twitch muscles move much slower, but tire a lot less easily. For instance, you can write with a pen for quite some time before your hand actually gets really tired. Smooth muscles, which make up your blood vessels, stomach lining, and other organ linings, are involuntary muscles as their movement is not under our control. As an example, it is impossible for us to tell our stomach to churn and digest our food faster! Cardiac muscles that make up our heart are able to work continuously without tiring. Like smooth muscles, cardiac muscles are also involuntary - we cannot make our heart work faster or slower! 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