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8 Cards in this Set

  • Front
  • Back
breathing muscles
diaphragm muscle and intercostal muscles
skeletal muscle
contractile tissue composed of protein filaments arranged to move the skeletal system
myofiber/sarcolemma/ T Tubules/ sarcomeres
myofiber: a single muscle cell

sarcolemma: cell membrane covering myofiber

T Tubules: areas in
sarcolemma that conduct the
contraction messages

sarcomeres: contractile units which hold the proteins in regular arrangements (are banded/striated: built for contractions)
thick.thin filaments
thick: myosin
thin filaments: strands of actin

come as a pair in muscles..used in contraction

contraction occurs when filaments slide past one another
antagonistic pair
muscles with opposing actions working together to provide smooth and controlled movements
energy sources for the muscle
ATP: store energy
creatine phosphate: can store 3-5 times that of ATP
stored glycogen: can store large amounts of energy (used during heavy exercizE)
aerobic metabolism: doesnt sotre energy...oxygen and nutrients are constantly supplied by the blood
aerobic vs. anaerobic
aerobic: metabolic pathway requires oxygen to burn glucose
anaerobic: metabolic pathways that occue in cytoplasm and burn glucose to lactic acid and release some energy
changing the size of a muscle
scientists think that the number of muscle fibers we have is inherited, so we alter muscle by enlarging cells (hypertrohy: new myofibrils added to make the old ones thicker)