Keywords: Human skeletal muscle tissue 3 - TEM.jpg Transmission electron microscope image of a thin longitudinal section cut through an area of human skeletal muscle tissue Image of muscle sarcomeres shows distinct banding pattern the darker bands are called A bands the A band includes a lighter central zone called the H band and the lighter bands are called I bands Each I band is bisected by a dark transverse line called the Z-line Paired mitochondria are on either side of the electron opaque Z-line The Z-Line marks the longitudinal extent of a sarcomere unit JEOL 100CX TEM http //remf dartmouth edu/imagesindex html http //remf dartmouth edu/images/humanMuscleTEM/source/5 html Louisa Howard PD Louisa Howard Cell biology Sarcomeres |