AMME1362 Lecture Notes - Lecture 3: T-Tubule, Endoplasmic Reticulum, Cardiac Muscle

• School: University of Sydney
• Department: Aeronautical Engineering (Mechanical)
• Course: AMME1362
• Professor: colin

Document Summary

Glossary of terms: sarcolemma: cell membrane of a muscle fibre cell, surrounds the sarcoplasm (cytoplasm of muscle fibre cell), transverse tubules (t tubules): extensions of the cell membrane that penetrate the centre of skeletal and cardiac muscle cells. Transmit action potential through cell, allow entire muscle fibre to contract simultaneously: sarcoplasmic reticulum: membranous structure surrounding each myofibril, help transmit action potential to myofibril. Form chambers (terminal cisternae) attached to t tubules: terminal cisternae: enlarged areas of the sarcoplasmic reticulum surrounding the transverse tubules. Functions of skeletal muscle tissue: produce skeletal movement, maintain posture and body position, support soft tissues, guard entrances and exits, maintain body temperature, store nutrient reserves. Overview of skeletal muscle: muscle tissue (muscle cells/fibres, connective tissues, nerves, blood vessels. Functions of connective/muscle tissue and skeletal muscle as a whole: Skeletal muscles attach to and move bones by contracting and relaxing in response to voluntary messages from the nervous system.