Movement of water across a membranes
Pollination only occurs with flowers. It is when pollen spreads from the male part of the flower to the female part of the flower. Fertilization only occurs with animals. Fertilization is when the sperm (from the male) attaches to the egg (in the female) which forms a zygote.
The correct answer is that the H zone becomes narrower.
The H-band refers to the region of the thick filaments, which is not overlaid by the actin (thin filaments). Within the H-zone is a thin M-line, which is formed of cross-connecting components of the cytoskeleton.
At the time of muscle contraction, the A-bands do not vary in their length, whereas the H-zone and the I-bands shorten. This makes the Z-lines come near to each other.
