BIO 307: Ch 9

• Smooth muscle tissue
• Cardiac muscle tissue
• Skeletal muscle tissue

Found in walls of blood vessels and reproductive, digestive, etc. organs

Found in the heart

Found in skeletal muscles

• Connective tissue
• Tendons and aponeuroses
• Nerves and blood vessels
• Muscle fibers

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

• Whole muscle is a bundle of fascicles
• Fascicles are a bundle of muscle fibers

Sarcolemma

• Surrounds skeletal muscle
• Separates muscle rom surrounding tissues/organs

• Surrounds fascicles
• Contains blood vessels and nerves

• Surrounds muscle fibers
• Supports capillaries

• Found in each muscle fiber
• Responsible for muscle contraction - they can contract which causes entire cell to shorten

• 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

• 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

• Area of neuromuscular synapse
• AP is generated