If the heart is a muscle, why doesn't it ever get tired?
As we were told during high school biology: cardiovascular muscle contains vast amounts of mitochondria as compared to other muscle types. Mitochondria are good. Therefore, more and stronger mitochondria = more efficient working muscle tissue.<p>One of my favorite professors holds a PhD in kinesiology (exercise physiology concentration) and wrote his dissertation on the mitochondria. As he stated many times in class: if you want to have a superhuman composition, acquire more mitochondria. he was always willing to bet his kids entire college tuition funds if you could show him a pill that would produce more mitochondria.