PEDS-100 Lecture Notes - Lecture 10: Erector Spinae Muscles, Tertius Of Iconium, Platysma Muscle

• School: MacEwan University
• Department: Physical Education
• Course: PEDS-100
• Professor: David Kato

Document Summary

Moion results from the contracion and relaxaion of muscles. Scieniic study of muscles is known as myology. Ability to respond to certain simuli electrical (acion potenial impulse) Ability to shorten and thicken (contract) generaing force to do work. Ability to return to normal shape ater contracion or extension. Endomysium: covers ibres, all are extensions of deep fascia. Tendon: atach muscle to bone, tendon sheath. Sot issue connecion - lips) zygomaicus smile: tendon extending as a broad lat layer. Myoibrils are the thick and thin ilaments: arranged in units called sarcomeres (basic funcional unit bounded by z discs, basic funcional unit, disinct areas. T tubules (act a conduit for electrical nerve impulse acivity) Fibres contain: sarcoplasm (muscle version of cytoplasm) Large amount of glycogen (stored glucose) and myoglobin (muscle protein also stored within the sarcoplasm) Sarcoplasmic reiculum: encircle each myoibril, similar to er contain ca++ (acts as a storage of calcium) A band: dark middle porion, thick and thin overlap.