This aspect is to reduce the pipeline pressure loss, the other is to avoid the path contraction obstacle to the mechanical cleaning pipelines.

The findings demonstrated that: Strength of muscles, especially power and contraction velocity, are declined with aging. It is directly associated with loss of daily living and self-care abilities.

In this microscopic view of a recent myocardial infarction, there is extensive hemorrhage along with myocardial fiber necrosis with contraction bands and loss of nuclei.