09 Skeletal Muscles

• smooth muscle no striation

• triad of T tubule + 2 terminal cisterna

• A not change

• H and I shrink

• thin filament regulate: regulated by tropomyosin, part of actin

• smooth muscle thick filament regulated

• EC coupling: voltage and depolarization of muscle cell coupled by Ca to contraction of muscle

• contraction of muscle cells follows AP

• CCB main effect on smooth muscle not skeletal

• must get Ca back in for more contraction