Question

(9/25/25) formative assessment assignment: chapter 6 the muscular system part 1 (suggested
8 of 16
microscopic anatomy of skeletal muscle
as mentioned previously, skeletal muscle fibers (cells) are multinucleate (figure 6.3a, p. 186). many oval nuclei can be seen just beneath the ( 1
) membrane, which is called the sarcolemma (sar\ko - lemah, \muscle husk\) in muscle fibers. the nuclei are pushed aside by long ribbonlike ( 2
), the myofibrils (mi\o - fibrilz), which nearly fill the cytoplasm. alternating light (i) bands and dark (a) bands along the length of the perfectly aligned
myofibrils give the muscle ( 3 ) its striated (banded) appearance. (think of the second letter of light, i, and the second letter of dark, a, to help
you remember which band is which.) a closer look at the ( 4 ) pattern reveals that the light i band has a midline interruption, a darker area
called the z disc, and the dark a band has a lighter central area called the h zone (figure 6.3b). the m line in the center of the h zone contains tiny ( 5
) rods that hold adjacent thick filaments together

o 1 banding 2 protein 3 plasma 4 organelles 5 fiber

o 1 protein 2 plasma 3 organelles 4 fiber 5 banding

o 1 plasma 2 organelles 3 fiber 4 banding 5 protein

o 1 fiber 2 banding 3 protein 4 plasma 5 organelles

o 1 organelles 2 fiber 3 banding 4 protein 5 plasma

Explanation:

Skeletal muscle fibers have nuclei beneath the plasma membrane (sarcolemma). Myofibrils, which are protein - like structures, fill the cytoplasm and give the muscle its striated appearance due to banding patterns. The Z - disc is in the I - band and the H - zone is in the A - band, and the M - line has protein rods.

Answer:

1. plasma 2. protein 3. banding 4. banding 5. protein