Presentation on theme: "JAMES VALLEY VOCATIONAL TECHNICAL CENTER"— Presentation transcript:
1 JAMES VALLEY VOCATIONAL TECHNICAL CENTER Muscular SystemBy: Emily BrostenStephanie ElhardJAMES VALLEY VOCATIONAL TECHNICAL CENTER
2 Introduction 1. 600 muscles in the body 2. Muscles are ~ made of bundles of muscle fibers which are held together by connective tissue.
3 3. When muscle fibers are stimulated by nerves ~they contract or become short and thick.
4 Voluntary ~ you can willfully control muscles Voluntary ~ you can willfully control muscles *facial expressions, chewing, swallowing, and movement of the head
5 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
7 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
8 2. Visceral/Smooth muscles. ~found in internal organs of the body 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
9 3. Skeletal~ most abundant. muscle. ~attached to bone 3. Skeletal~ most abundant muscle ~attached to bone ~causes body to move ~voluntary
11 1. Attaches to bones to provide voluntary movement. 2. During contractions provide heat and energy.
12 3. Helps maintain posture. 4. Some protect internal organs.
13 SKELETAL MUSCLES ATTACH TO BONES IN VARIOUS WAYS
14 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)
15 2. Fascia ~ tough, sheet-like membrane that covers and protects tissue 2. Fascia ~ tough, sheet-like membrane that covers and protects tissue *lumbodorsal fascia (surrounds the deep muscles of the back and trunk)
16 3. Origin ~ When a muscle attaches to the bone, the end doesn’t move 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
17 4. Insertion ~ the end of the muscle that attaches to a bone that moves -where the muscle ends