AP 1 (9-1)
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AP 1 (9-1)
AP 1 chapter 9.
What are the six functions of skeletal muscles?
Produce skeletal movements
Maintain posture and body position
Supports soft tissues
Gaurds entrances and exits
Maintain body teamperature
Provide nutrient reserves
What are the five connective tissue coverings?
Layers of dense connective tissue that surround and seperate each muscle. These extend beyond the ends of the muscle to form tendons that are fused to the periosteum of bones.
Broad sheets of connective tissue that attaches to bone or to coverings of adjacent muscles.
Layer of connective tissue that closely surrounds a skeletal muscle.
Surrounds individual bundles (fascicles) within each muscle.
Surrounds each muscle cell (fiber)
What is the sarcolemma?
Cell membrane of the muscle cell
What is Sarcoplasm?
What does sarcoplasm contain?
What are thick filaments of myofibrils made up of?
What are thin filaments of myofibrils made up of?
What produces striations?
The organization of thick and thin filaments.
Describe I bands.
Light bands made up of actin filaments are anchored to Z lines.
Describe A bands.
Dark bands are made up of overlapping thick and thin filaments.
Describe H bands.
These consists of myosin (thick) filaments located in the center of A bands.
Describe M lines.
Thick area in the center of the H zone that consists of proteins that hold the thick filaments in place.
Consists of two twisted strands with globular crossbridges projected outward along the strands.
A globular protein with myosin binding sites.
Describe tropomysin and troponin.
Protiens associated with the surface of the actin filaments.