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.
Whatâs yours is ours, But whatâs mine is mine. What's yours is ours, But what's mine is mine. THE saying what's yours is mine and what's mine is yours, generally holds true in relationships until it comes to the issue of money, as some individuals feel it never hurts to have a secret stash for when the bumper hits the road.