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Published byMilo Norton Modified over 9 years ago
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The Muscular System Lesson 1: The Muscular System
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Upon completion of this lesson, students should be able to … Explain the functions of muscle. Identify and discuss types of muscle tissue. Describe the muscular system of the body.
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Bundles of muscle fibers Fibers contract; Muscles contract myoneural junction
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Human has more than 600 muscles Muscles make up about 42% of body weight
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Contractibility Heat production Stability Tonicity
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Muscular System
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Watch This!!!!!
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the body can move voluntary, striated muscles.
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Attach to skeletal bones Allow for voluntary movement Wrapped in layers ◦ Fascia ◦ Tendon attach muscle to bone motor neurons
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muscle that pumps blood to involuntary muscle.
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Myocardium Occurs in walls of heart Allows for involuntary pumping action
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involuntary nonstriated continuous, thin layer forming organs and other structures.
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Found in tissue in walls of hollow organs Responsible for movement of internal organs
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2 types ◦ Voluntary: Allows the person to dictate movement ◦ Involuntary: Acts without conscious direction
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Type of chemical energy needed for muscular contractions either aerobic or anaerobic (without oxygen) means
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Occurs when skeletal muscles are used for more than 1 or 2 minutes Lack of oxygen reduces body’s ability to produce energy
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Oxygen “owed” to body is the debt can only be recovered by increased respiration
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accumulated lactic acid decreases the ability to contract results in fatigue, cramps also occurs if blood supply is interrupted
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2 lines Tallest to shortest
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Fascia ◦ Covers entire skeletal muscle ◦ Separates muscles from one another
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Muscles of the jaw (chewing):
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Deltoid – abduction/extension of the arm at the shoulder Common place for IM injections
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Right now Right now
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Diaphragm ◦ Separates thoracic and abdominal cavities External and internal intercostals
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External and internal obliques Transversus abdominis Rectus abdominis
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Click Here Click Here
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Gluteus medius – aka the anterior gluteal site Vastus lateralis – extends knee
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Exercise physiologist Neurologist Rheumatologist Sports Medicine Physician
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