If you clench your hand into a fist, this is approximately the same size as your heart. It is located in the middle of the chest and slightly towards the left. The heart is a large muscular pump ...

Heart rate is measured in beats per minute (bpm). During exercise the heart rate increases so that sufficient blood is taken to the working muscles to provide them with enough nutrients and oxygen.

This study points out that it is still unclear how marijuana affects the cardiovascular system. Researchers believe it affects heart rhythm regulation, heightens oxygen demand in the heart muscle ...