The Muscular The Muscular SystemSystemLesson 1:Lesson 1:The Muscular SystemThe 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 fibersFibers contract; Muscles contractmyoneural junction
Human has more than 600 muscles
Muscles make up about 42% of body weight
Contractibility
Heat production
Stability
Tonicity
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, crampsalso occurs if blood supply is interrupted
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
Right now
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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