I believe that it creates shocks to try and start the heart up again after a heart attack. (why the sticky pads are put with the heart in the middle)
<span>Old Theory – Social Categorization & Social Identity Theory <span>Earlier on, Tajfel (1971) argued that stereotypes developed through a natural process of social categorization, which is when people categorize groups of people based on common traits or characteristics.</span></span>
One of the main reasons why life expectancy dramatically rose in the past century was due to different factors. One that surely contributed to them was better access to medical equipment and medical advances themselves. As well as better nutrition that was available to the common person.
i think it's <em>a) insometric stretching</em>
hope this helps
