Answer:
When the level of calcium ions declines the sarcoplasm stops the sliding.
Step-by-step explanation:
Sarcoplasm can be described as the cytoplasm for the cells of muscles. It contains important structures such as the myofibrils.
The following steps would occur when the level of calcium ions would decline:
The sarcoplasm would stop the sliding of the thin filaments.
The actin filaments would be migrated in the M line
This would lead the bands in the I region to shorten.
The Z region would compress.
The H region would diminish.