Zambia is in Southern Africa, east of Angola, between 150 00 S and 300 00 E with an area of 752,614 sq km out of which 740,724 sq km are land and 11,890 sq km water (The World Factbook, 2006).
-There are two main parts of the striation pattern of skeletal muscle fibers: * The light bands (I bands) are made up of tink filaments of actin attached to Z lines.*The dark bands (A bands) are made up of thick filaments of myosin that overlap thin filaments of actin.There are two main parts of the striation pattern of skeletal muscle fibers: * The light bands (I bands) are made up of tink filaments of actin attached to Z lines.
Striations are produced by the arrangement of thick and thin filaments. Striations - the alternation of dark and light bands within a myofibril. Thick and thin filaments overlap to form dark A bands. Thin filaments alone form light I bands. The H band, within the A band, is where there is no overlap. The Z-line is a dark line within the I bands. Two Z-lines delimit the unit of muscle contraction - the Sarcomere. During muscle contraction, sarcomeres shorten, the distance between. Z-lines decreases - the width of the H and I-bands also decreases.