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Muscular System

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Tracie Haan M.E. Meyerhofer Chelsea Friesen Muscular System Muscular System Physiology 4 main functions of the muscles: Produces movement Maintain posture Reinforces ... – PowerPoint PPT presentation

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Title: Muscular System


1
Muscular System
  • Tracie Haan
  • M.E. Meyerhofer
  • Chelsea Friesen

2
Muscular System Physiology
  • 4 main functions of the muscles
  • Produces movement
  • Maintain posture
  • Reinforces and stabilizes joints
  • Generates heat

3
Muscle Types
  • There are three main
  • muscle types
  • Skeletal
  • Cardiac
  • Smooth

4
Skeletal Muscles
  • The four primary functions of skeletal muscles
  • Movement
  • Posture
  • Support
  • Heat regulation
  • Controlled under somatic nervous system
  • Voluntarily Controlled
  • Striated
  • Most skeletal muscles are attached to bones
  • by bundles of collagen fibers known as tendons.

5
Skeletal Muscle Structure
  • Skeletal Muscle Cells (myocytes)
  • myoblasts
  • Myofibrils
  • Skeletal Muscles
  • Belly
  • Fascia
  • Epimysium
  • Perimysium
  • Endomysium
  • Muscle Fiber (Cell)
  • Tendon

6
Skeletal Muscles
  • Major Muscles

6
7
Mechanics Of Movements Demo
8
Cardiac Muscles
  • Two types of cardiac cells
  • Electrical and myocardial
  • Heats contracts rhythmically the whole life of an
    organism.
  • Autonomically controlled, involuntary muscle,
    polarized
  • Striated
  • Cardiac muscles are auto-rhythmic
  • Muscles contract even in the absence of neuronal
    innervation (pacemaker cells)

9
Smooth Muscles
  • All involuntary actions within body with
    exception to the heart
  • 2 types
  • Visceral smooth muscle
  • Multiunit smooth muscle
  • No striations due to the absence of sarcomeres
  • Some smooth muscle areas include
  • the walls of the viscera, iris of the eye,
    urinary tract and blood vessels.
  • Stimulate movement such as peristalsis

10
Common Muscular Diseases
  • Muscular Dystrophy-
  • Group of genetic disorders
  • Muscle weakness and loss of muscle tissue
  • Gets worse over time
  • No cure
  • Sprains and Strains-
  • Sprain-
  • Stretched or torn ligament
  • Ligaments connect bones at the joints
  • Strain-
  • Stretched or torn tendon or muscle
  • Tendons connect the muscle to the bone

11
Common Muscular Diseases
  • Myositis-
  • Inflammation of muscle fibers
  • Swelling of skeletal muscles
  • Group of diseases
  • Causes muscle weakness and degeneration

12
Contraction and Relaxation Lab
13
Sources
  • http//www.livestrong.com/article/261129-smooth-mu
    scle-structure/
  • http//www.andrews.edu/schriste/Course_Notes/Anat
    omy__Physiology__and_Elect/anatomy__physiology__an
    d_elect.html
  • http//nursingcrib.com/anatomy-and-physiology/anat
    omy-and-physiology-muscular-system/
  • http//www.ncbi.nlm.nih.gov/pubmedhealth/PMH000217
    2/
  • http//www.livestrong.com/article/83692-common-mus
    cular-diseases/
  • http//healthmad.com/medicine/human-muscular-syste
    m/
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