No. As handsonanatomist mentions it has to do with blood flow to the myocardium(heart muscle itself). The heart muscle itself only receives oxygen during diastole(relaxation), but as heart rate increases the relative length of diastole shortens compared to systole(heart contraction). TLDR; your heart gets tired because it only gets oxygen while relaxed, and the relative amount of time spent relaxing is less.
Mind vs Brain. Though mind and brain are two terms that are understood to mean the same when used in the colloquial sense, there is a difference between mind and brain. There is certainly some difference between the two in their making. Brain is made of physical matter while mind is not made of physical matter. To be more elaborate brain is made up of cells, blood vessels and nerves to name a few. Mind is nothing but the thought that resides in the brain.
What is yours is mine, and what is mine is my own lol but........ its actually. What is yours is mine and mine is yours, its just a packed kids used to do when they become best friends. diamondjade Â· 9 years ago.