9808 Lecture Notes - Lecture 6: Sliding Filament Theory, Membrane Potential, Cisterna

• School: University of Canberra
• Department: University of Canberra
• Course: 9808
• Professor: Julie Cooke

Document Summary

Muscles transform atp to directed mechanical energy (contraction) to exert force (chemical to mechanical energy) Types of muscle tissue: skeletal: attach to and cover boney skeleton, longest muscle cells (striated muscles, cardiac: only in heart (sap, smooth: walls of hollow organs e. g. stomach. Skeletal muscle: have to have nervous impulse to cause contraction, voluntary/conscious, contract rapidly, tire easily, very powerful, extremely adaptable and can exert range of forces, very controlled amount of force generated - regimented + precise. Involuntary/unconscious: steady rate of contraction due to hearts pace maker, under neutral control and can respond to demands, sequential contractions - slight delay from discs. Involuntary/unconscious: forces food + substances through body, controlled by nervous and endocrine system, do(cid:374)"t fatigue - contractions at all times. Responsible for skeletal muscle fibre contraction (whole thing contracts) Each sarcomere consists of a band, i bands, h zone, z discs and m line. A band --> where thick myosin filaments and thin actin filaments overlap.