1. The Muscular System Lesson 1: The Muscular System

2. 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.

3.  Bundles of muscle fibers  Fibers contract;  Muscles contract  myoneural junction

4.  Human has more than 600 muscles  Muscles make up about 42% of body weight

5.  Contractibility  Heat production  Stability  Tonicity

6. Muscular System

7. Watch This!!!!!

9.  the body can move voluntary, striated muscles.

10.  Attach to skeletal bones  Allow for voluntary movement  Wrapped in layers ◦ Fascia ◦ Tendon attach muscle to bone  motor neurons

11.  muscle that pumps blood to involuntary muscle.

12.  Myocardium  Occurs in walls of heart  Allows for involuntary pumping action

13.  involuntary  nonstriated  continuous, thin layer  forming organs and other structures.

14.  Found in tissue in walls of hollow organs  Responsible for movement of internal organs

16.  2 types ◦ Voluntary:  Allows the person to dictate movement ◦ Involuntary:  Acts without conscious direction

17.  Type of chemical energy  needed for muscular contractions  either aerobic or anaerobic (without oxygen) means

18.  Occurs when skeletal muscles are used for more than 1 or 2 minutes  Lack of oxygen  reduces body’s ability to produce energy

19.  Oxygen “owed” to body is the debt  can only be recovered by increased respiration

20.  accumulated lactic acid  decreases the ability to contract  results in fatigue, cramps  also occurs if blood supply is interrupted

21.  2 lines  Tallest to shortest

22.  Fascia ◦ Covers entire skeletal muscle ◦ Separates muscles from one another

23.  Muscles of the jaw (chewing):

24.  Deltoid – abduction/extension of the arm at the shoulder  Common place for IM injections

25.  Right now Right now

26.  Diaphragm ◦ Separates thoracic and abdominal cavities  External and internal intercostals

27.  External and internal obliques  Transversus abdominis  Rectus abdominis

28.  Click Here Click Here

29.  Gluteus medius – aka the anterior gluteal site  Vastus lateralis – extends knee

33.  Exercise physiologist  Neurologist  Rheumatologist  Sports Medicine Physician