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.
Mine: is a possessive pronoun. Example :That is mine. My: is a possessive adjective. Example : That is my car. This is my iPodâ --- - This iPod is mine. This is my pen ------ This pen is mine. This is my car ------ This car is mine. Those are my paintings ------ those paintings are mine.
Difference Between Author and Writer. We often use the words author and writer interchangeably. But indeed both these words are quite different. A writer is a person who writes a book, article, or any literary piece, while an author is essentially the person who originates the idea, plot, or content of the work being written. At times, the author and writer can be the same person. In case of an autobiography, a person writes about the own life.