[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"detail-sidebar-cat-0-en-105":3,"doc-seo-414548-105":59,"doc-detail-414548-en":130},{"code":4,"msg":5,"data":6},0,"success",[7,13,18,23,28,33,38,43,48,51,55],{"id":8,"doc_module":4,"doc_module_name":9,"category_name":10,"show_sort_weight":11,"slug":12},1,"Document","Story & Novel",90,"story-novel",{"id":14,"doc_module":4,"doc_module_name":9,"category_name":15,"show_sort_weight":16,"slug":17},2,"Literature",80,"literature",{"id":19,"doc_module":4,"doc_module_name":9,"category_name":20,"show_sort_weight":21,"slug":22},4,"Exam",70,"exam",{"id":24,"doc_module":4,"doc_module_name":9,"category_name":25,"show_sort_weight":26,"slug":27},5,"Comic",60,"comic",{"id":29,"doc_module":4,"doc_module_name":9,"category_name":30,"show_sort_weight":31,"slug":32},6,"Technology",50,"technology",{"id":34,"doc_module":4,"doc_module_name":9,"category_name":35,"show_sort_weight":36,"slug":37},7,"Healthcare",40,"healthcare",{"id":39,"doc_module":4,"doc_module_name":9,"category_name":40,"show_sort_weight":41,"slug":42},8,"Research & Report",30,"research-report",{"id":44,"doc_module":4,"doc_module_name":9,"category_name":45,"show_sort_weight":46,"slug":47},9,"Religion & Spirituality",20,"religion-spirituality",{"id":46,"doc_module":4,"doc_module_name":9,"category_name":49,"show_sort_weight":46,"slug":50},"World Cup","world-cup",{"id":52,"doc_module":4,"doc_module_name":9,"category_name":53,"show_sort_weight":52,"slug":54},10,"Lifestyle","lifestyle",{"id":56,"doc_module":4,"doc_module_name":9,"category_name":57,"show_sort_weight":24,"slug":58},19,"General","general",{"code":4,"msg":60,"data":61},"ok",{"site_id":62,"language":63,"slug":64,"title":65,"keywords":66,"description":67,"schema_data":68,"social_meta":123,"head_meta":125,"extra_data":127,"updated_unix":129},105,"en","muscle-tissue-and-skeletal-muscle-system-chapter-13-skeletal-muscle","Muscle Tissue and Skeletal Muscle System - Chapter 13 - Skeletal Muscle","","This chapter introduces muscle tissue roles across the body and distinguishes skeletal, cardiac, and smooth muscle by function, structure, and location. It compares the three muscle types through shared general properties—contractility, excitability, extensibility, and elasticity—and then explains excitation–contraction coupling as the electrical precursor to force generation. It emphasizes skeletal muscle physiology, including major functions, histological features, and somatic nervous system control, before briefly outlining cardiac muscle and smooth muscle context.",{"@graph":69,"@context":122},[70,84,105],{"@type":71,"itemListElement":72},"BreadcrumbList",[73,77,79,82],{"item":74,"name":75,"@type":76,"position":8},"https://docshare.wps.com","Home","ListItem",{"item":78,"name":9,"@type":76,"position":14},"https://docshare.wps.com/document/",{"item":80,"name":35,"@type":76,"position":81},"https://docshare.wps.com/document/healthcare/",3,{"item":83,"name":65,"@type":76,"position":19},"https://docshare.wps.com/document/muscle-tissue-and-skeletal-muscle-system-chapter-13-skeletal-muscle/414548/",{"url":83,"name":65,"@type":85,"image":86,"author":91,"headline":65,"publisher":94,"fileFormat":97,"inLanguage":63,"description":67,"dateModified":98,"datePublished":99,"encodingFormat":97,"isAccessibleForFree":100,"interactionStatistic":101},"DigitalDocument",{"url":87,"@type":88,"width":89,"height":90},"https://docshare.wps.com/thumbnails/muscle-tissue-and-skeletal-muscle-system-chapter-13-skeletal-muscle/414548.png","ImageObject",300,407,{"name":92,"@type":93},"Aldword","Person",{"url":74,"name":95,"@type":96},"DocShare","Organization","application/pdf","2026-10-30","2026-09-28",true,{"@type":102,"interactionType":103,"userInteractionCount":24},"InteractionCounter",{"@type":104},"ViewAction",{"@type":106,"mainEntity":107},"FAQPage",[108,114,118],{"name":109,"@type":110,"acceptedAnswer":111},"What general properties are shared by all three types of muscle tissue?","Question",{"text":112,"@type":113},"They share contractility, excitability, extensibility, and elasticity—allowing muscle cells to generate force when stimulated and to stretch and recoil under applied force.","Answer",{"name":115,"@type":110,"acceptedAnswer":116},"How does excitation lead to muscle contraction?",{"text":117,"@type":113},"Electrical excitation and action potentials initiate muscle contraction, a process described as excitation–contraction coupling. The detailed mechanism varies by muscle type.",{"name":119,"@type":110,"acceptedAnswer":120},"What controls skeletal muscle contraction and relaxation?",{"text":121,"@type":113},"Skeletal muscle contraction signals come completely from the nervous system, and relaxation occurs when there is no nerve signal to contract. Control is mainly under voluntary somatic nervous system influence, with reflexes acting as an automated exception.","https://schema.org",{"og:url":83,"og:type":124,"og:title":65,"og:site_name":95,"og:description":67},"article",{"robots":126,"canonical":83},"index,follow",{"doc_id":128,"site_id":62},414548,1790789424,{"code":4,"msg":5,"data":131},{"doc_id":128,"user_id":132,"nickname":92,"user_avatar":133,"doc_module":4,"category_id":34,"category_name":35,"doc_title":65,"doc_description":67,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":24,"is_deleted":4,"is_public":8,"is_downloadable":8,"audit_status":8,"page_count":139,"language":140,"language_code":63,"site_id":62,"html_lang":63,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":67,"update_tm":144,"read_time":145,"preview_page_count":4},2336478940917,"https://ap-avatar.wpscdn.com/davatar_6f874abed73319feea01a86fa6f0fab8","Section Two: Chapter 13: Muscle Tissue and Skeletal Muscle System  \nIn the body, muscle tissue plays a variety of important role across every system. Within the body there are three different types of muscle tissue: 1) Skeletal muscle, 2) Cardiac muscle, and 3) Smooth muscle.  \nThese three types of muscle are very different in their function, structure and location, and this contributes to the versatility of muscle tissue. Despite key differences in the three muscle types, there are many fundamental commonalities that all muscle tissues share. In this chapter we will examine the basic similarities that all muscle tissues have, and then focus on how each is different and distinctly suited to its particular role.  \nThis chapter provides an initial comparison of the three muscle types in terms of general functions and characteristics as summarized in Table 13. 1. The emphasis then moves to an in depth exploration of skeletal muscle. The chapter is closed with a presentation of the nature of smooth muscle physiology. The details of cardiac muscle are covered in chapter 14, with other details of smooth muscle covered in the ANS, vascular and digestive physiology in chapters 9, 16 and 20.  \nAll Muscle Tissues share General Properties  \nAll three muscle tissues have important general properties in common, they are:  \n1) Contractility – muscle cells typically shorten when electrically stimulated, generating force.  \n2) Excitability – muscle cells respond to electrical stimulation and exhibit action potentials.  \n3) Extensibility – muscle tissue can stretch when a force is applied to it.  \n4) Elasticity – muscle tissue can recoil to its original shape when the force stretching it is removed.  \nHow are the three types of Muscle Different?  \nTo paint a broad picture, we can concisely distinguish the three type of muscle and their roles this way:  \n1) Skeletal Muscle – attached to the skeletal system (bones)– for body movement.  \n2) Cardiac Muscle – found in the heart – for controlling blood flow and pressure.  \n3) Smooth Muscle – in walls of internal organs, in blood vessels – for actions in organs and vessels.  \nAll muscle cells have charges across their plasma membranes that can change from being polarized (very different on either side) to being depolarized (more similar) . If this language sounds familiar it is because we are talking about cell voltage and action potentials. For all muscle cells, the electrical excitation of the action potential is the precursor (signal) to initiate muscle contraction and generate force. In general this is referred to as excitation-contraction coupling. The precise mechanism each muscle type engages in varies, and will be explored separately.  \nControl of Muscle  \nThe term ‘control’ here means where do the signals come from that effect muscle action. In terms of skeletal muscle, the signals for it to contract come completely from the nervous system. And when skeletal muscle relaxes it is due to receiving no signal from the nerves to contract! While the nervous system can influence the excitability of cardiac and smooth muscle to some degree, both cardiac muscle and smooth muscle can respond to other stimuli, such as hormones, paracrine and other local stimuli.  \nLet’s now take a look at each type of muscle tissue more closely in order to understand their similarities and important differences in terms of function, location, histology and control.  \nSkeletal Muscle  \nSkeletal muscle can be seen just deep to the skin and its primary role is body movement. It works together with the skeletal system (bones) and movable articulations (joints) in the body to achieve the movement of a specific body part or whole body movement.  \nFor example, the tailor’s muscle of the thigh is called the sartorius shown in Fig. 13.1 to the right. It is the longest muscle in the human body. It can measure up to 600 mm in length, this is just under 24 inches, which means it’s about 2 feet long!  \nFunctions  \nMost skeletal mus","cbCaivGA2FMGs0ZR","https://ap.wps.com/l/cbCaivGA2FMGs0ZR","pdf",1756373,41,"English","# Section Two: Chapter 13: Muscle Tissue and Skeletal Muscle System\n## All Muscle Tissues share General Properties\n## How are the three types of Muscle Different?\n## Control of Muscle\n## Skeletal Muscle\n### Functions\n### Histology\n### Control\n## Cardiac Muscle","[{\"question\":\"What general properties are shared by all three types of muscle tissue?\",\"answer\":\"They share contractility, excitability, extensibility, and elasticity—allowing muscle cells to generate force when stimulated and to stretch and recoil under applied force.\"},{\"question\":\"How does excitation lead to muscle contraction?\",\"answer\":\"Electrical excitation and action potentials initiate muscle contraction, a process described as excitation–contraction coupling. The detailed mechanism varies by muscle type.\"},{\"question\":\"What controls skeletal muscle contraction and relaxation?\",\"answer\":\"Skeletal muscle contraction signals come completely from the nervous system, and relaxation occurs when there is no nerve signal to contract. Control is mainly under voluntary somatic nervous system influence, with reflexes acting as an automated exception.\"}]","Muscle Tissue and Skeletal Muscle System - Chapter 13 - Skeletal Muscle | PDF",1790597904,103]