Coronary circulation Coronary circulation receives 5%of the resting cardiac output from the left heart, and mostly returns it to the right heart Heart muscle consumes as much O2 as does equal mass of sm during vigorous exercise Heart tissue extracts maximal amount of o2 at rest The only way to increase of energy is by increasing blood flow Autoregulation: relative stable flow between 70 and more than 150mmHgCoronary circulation • Coronary circulation receives 5%of the resting cardiac output from the left heart, and mostly returns it to the right heart • Heart muscle consumes as much O2 as does equal mass of SM during vigorous exercise • Heart tissue extracts maximal amount of O2 at rest • The only way to increase of energy is by increasing blood flow • Autoregulation: relative stable flow between 70 and more than 150mmHg