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Muscular System. By: Emily Brosten Stephanie Elhard JAMES VALLEY VOCATIONAL TECHNICAL CENTER. Introduction. 1. 600 muscles in the body 2. Muscles are ~ made of bundles of muscle fibers which are held together by connective tissue.

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muscular system

Muscular System

By: Emily Brosten

Stephanie Elhard

JAMES VALLEY VOCATIONAL TECHNICAL CENTER

introduction
Introduction
  • 1. 600 muscles in the body
  • 2. Muscles are ~ made of bundles of muscle fibers which are held together by connective tissue.
slide3
3. When muscle fibers are stimulated by nerves ~they contract or become short and thick.
slide4
Voluntary ~ you can willfully control muscles *facial expressions, chewing, swallowing, and movement of the head
slide5
Involuntary ~ function without the person thinking about contracting the muscles. *digestive system, heart muscles, and blood vessels **Some muscles are both voluntary and involuntary ~ example eye blinking
slide7
1. Cardiac muscles ~ cells are packed so closely together its hard to tell one cell from another. ~forms walls of the heart ~contact to circulate blood ~involuntary
slide8
2. Visceral/Smooth muscles ~found in internal organs of the body *digestive, respiratory system, blood vessels, and eyes. ~muscles contract to cause movement in these areas ~involuntary function without the person thinking about contracting the muscle
slide9
3. Skeletal~ most abundant muscle ~attached to bone ~causes body to move ~voluntary
slide11
1. Attaches to bones to provide voluntary movement.
  • 2. During contractions provide heat and energy.
slide12
3. Helps maintain posture.
  • 4. Some protect internal organs.
slide14
1.Tendon ~ strong, tough connective tissue cord, connect muscle to bone *Achilles Tendon (attaches to calf muscle and heel bone) *lumbodorsal fascia (surrounds the deep muscles of the back and trunk)
slide15
2. Fascia ~ tough, sheet-like membrane that covers and protects tissue *lumbodorsal fascia (surrounds the deep muscles of the back and trunk)
slide16
3.Origin ~ When a muscle attaches to the bone, the end doesn’t move. -usually attaches closer to the trunk of the body -where the muscle begins
slide19
1. Contractability ~ ability to shorten and thicken (when muscles work they contract that is they get shorter and thicker)
slide20
2. Extensibility ~ ability to stretch (when muscle is relaxed it becomes longer and thinner) *some muscles work while others relax *
slide21
3.Elasticity ~ ability to return to original length
  • 4. Irritability ~ability to respond to stimulus
  • 5. Tone ~ slight tension in the muscles at all times, even at rest
slide23
1. Adduction ~ moving a body part toward the midline
  • 2. Abduction ~ moving a body part away from the midline
slide29
8. Depressors: lower a part of the body
  • 9. Supination: the act of rotating the arm so the palm of the hand is upward.
terminology
Terminology
  • Muscle tone: muscles that are partially contracted at all times, even when they may not be in use.
slide32
Contracture: severe tightening of a flexor muscle that results in bending of a joint.
  • Myology: my/o = muscles
          • ology = study of
    • the study of muscles
myology

MYOLOGY

The Study of Muscles

CHARTS