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Muscles

This comprehensive guide explores the fundamental aspects of muscle tissue, including its various types: skeletal, cardiac, and smooth. Learn about the essential functions of muscle tissue, such as facilitating movement, stabilizing body positions, and regulating organ volume. Delve into key characteristics of muscle tissue: excitability, contractility, elasticity, and extensibility. Discover the cellular structure of each type of muscle, from muscle fibers in skeletal tissue to the intercalated discs in cardiac muscle. Enhance your knowledge of how muscles operate within the body!

charity-carlson
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Muscles

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  1. Muscles

  2. Roots To Know • Calat – something inserted • Erg – energy • Hyper – excess • Laten – hidden • Myo – muscle • Sarco – flesh • Syn – together • Tetan – stiff • Troph – well fed

  3. Functions of Muscle Tissue • Movement • Stabilize body positions • Regulate organ volume • Sphincter – closes off the exterior outlets of hollow organs – controls the size of an opening • Urinary bladder • Move substances within the body • Produce heat

  4. Characteristics of Muscle Tissue • Excitability/Responsiveness – the ability to receive and respond to stimuli • Contractility – the ability to shorten/contract • Elasticity-- the ability to return to its original shape after contraction or extension • Extensibility -- the ability to stretch or extend

  5. Types of Muscle Tissue • Skeletal • Cardiac • Smooth These sound really familiar—where can each be found????

  6. Skeletal Muscle Tissue • Composed of cells called Muscle Fibers • Muscle Fiber • Mitochondrion – many in one fiber – Why? • Sarcolemma – plasma membrane, stores Ca2+ • Sarcoplasm – equivalent of cytoplasm • Muscle – group of muscle fibers bundled together

  7. Cardiac Muscle • Muscle fibers are connected by intercalated discs • Normal heart beat ~75 beats/minute • Requires a steady supply of oxygen and nutrients • Cells contain more mitochondria than skeletal muscle fibers

  8. Smooth Muscle Tissue • Prolonged presence of Ca2+ provides the smooth muscle tone – state of continued partial contraction • Stretchiness – stomach, bladder, uterus

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