PEDS101 Lecture Notes - Lecture 9: Sliding Filament Theory, Pearson Education, Autonomic Nervous System

• School: University of Alberta
• Department: Physical Education and Sport
• Course: PEDS101
• Professor: David Collins

Document Summary

Skeletal muscle fibers are large, multinucleate cells that appear striped or striated under the microscope: attached to and moves bones, regulated by somatic n. s. nervous system. Cardiac muscle fibers are also striated but they are smaller, branched, and uninucleate. Cells are joined in series by junctions called intercalated disks: pumps blood, pumps blood, regulated by autonomic nervous system and chemical signals (e. g. hormones) Smooth muscle fibers are small and lack striations: surrounds organs/vessels, regulated by autonomic nervous system and chemical signals (e. g. hormones) For smooth and cardiac muscle, there is antagonistic control. A group of muscle fibres bundled together in connective tissue is a muscle fascicle. Sarcolemma- muscle fibre membrane, carries action potential along muscle fibre. Thick and thin filaments contract and slide together and is what allows for contacting of each myofibril. A single muscle cell is a multinucleated muscle fibre that contains many myofibrils (b) T-tubules- carry action potentials deep into muscle fibre.