DBQ: Transverse Sections of Striated Muscle (p.267)
1) Different from a transverse section of the muscle, the longitudinal section goes along the long axis. The transverse section crosses the longitudinal section, or in short stands perpendicular to it.
2) The light band
3) The first diagram consists of both the second and third pattern together, so the first and second are similar as well as the first and third. Unlike the first pattern, the second and third pattern have only one kind of homogeneous types of dots. The first has a contrasting 2 types of dots in its pattern.
4) The pattern of dots in first diagram represents the actin and myosin in the sacromere, thus show heterozygous traits of dots. The following diagram has dots to show the central region of the dark band, representing just the thick myosin. Lastly, the diagram represents the light band, with the dots as thin actin.