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