The heart is a muscular organ roughly the size of your fist. As the heart muscle contracts, it propels the blood out into the vascular system. The heart’s chambers and valves are arranged to direct ...

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Locus of control refers to the degree to which an individual feels a sense of agency in regard to his or her life. Someone with an internal locus of control will believe that the things that ...

A sense of control is considered a highly adaptive trait. In one well-controlled study that measured 35 indicators of health, those with the highest sense of control had reduced risk of mortality ...