Found in walls of blood vessels and reproductive, digestive, etc. organs
Cardiac muscle tissue
Found in the heart
Skeletal muscle tissue
Found in skeletal muscles
The 4 components of a muscle
Connective tissue
Tendons and aponeuroses
Nerves and blood vessels
Muscle fibers
Difference between origin and insertion
The origin remains relatively stational when the muscle contracts while the insertion is where the muscle attaches to the bone that is pulled toward the origin when the muscle contracts
Difference between muscle fiber, fascicle and whole muscle
Whole muscle is a bundle of fascicles
Fascicles are a bundle of muscle fibers
Plasma membrane of muscle fibers
Sarcolemma
Function of epimysium
Surrounds skeletal muscle
Separates muscle rom surrounding tissues/organs
Function of perimysium
Surrounds fascicles
Contains blood vessels and nerves
Function of endomysium
Surrounds muscle fibers
Supports capillaries
Myofibrils
Found in each muscle fiber
Responsible for muscle contraction - they can contract which causes entire cell to shorten
Sliding filament theory
During contraction:
1) H and I bands get smaller
2) Zone of overlap gets larger
3) Z lines move clser together
4) Width of A band remains the same
Effect of sarcomere length in tension
Greatest tension formed at optimal resting length where the max number of rcross-bridges can form
Decreased length, it cannot shorten further because the thick fillaments are jammed against Z line
Increase in length reduces the number of potential cross-bridge interactions, stretch futher and the thin and thick filaments can't interact at all