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15 Cards in this Set

  • Front
  • Back
functions fo muscle system
1. moves skeleton
2. protection
3. maintains posture
4. generates 80% of body heat
shivering
involuntary muscular contractions which occur when core body temp. drows to low
Internal structure of muscle
1. muscle as a whole
2. fascicles -bundles of fibers
3. fibers
4. myofibrils
5. myofilaments
6. sarcomeres
fibers
1. actual cell o a muscle
2. microscopic
3. striated
4. have 100's of nuclei
5. run from tendon to tendon
6. voluntary or involuntary
7. sarcolemma- cell membrain
8. sarcoplasm- contents of cell(no nucleus)
myofibrils
1. cylindrical structures that run the lenth of a fiber
2. 100's of these within each fiber
3. sarcoplasmic reticulum wraps around each myofibril; iternal circulatory system
myofilaments
1. protein strands
2. 100's of these within each myfibrils
3. end view shows that they are surrounded by 6 actin in a hexagonal pattern
4. 2:1 ratio of actin to myosin
5. side view shows series of sarcomeres
types of myofilaments
1. myosin
2. actin
3. titin
myosin
thick
actin
thin
titin
anchors myosin to Z line/disc
sarcomeres (side view, resting state
1. contractile unit of a fiber
2. outlined by Z line/disc on each side
3. consists of overlapping actin and myosin
4. cylindrica section of a myofibril
Z line/disc
Z line/disc
consists of short protein that connect the actin from two adjoining sarcomeres
sarcomeres (side view, resting state)
2a
"A" band
defined by the length of the myosin
Darker then I bands
sarcomeres (side view, resting state)
2a
"I" band
Purely actin from two adjoining sarcomeres
sarcomeres (side view, resting state)
2a
"H" band
purely myosin in middle of sarcomere crossbridges- heads that emanate from myosin