<prompt> Myocardial oxygen demand depends upona Preloadb Afterloadc Intramyocardial tensiond Blood Hb concentrationabbcabcbcd  <response>: There are two terms to remember. Myocardial oxygen demand and myocardial oxygen supply. Hb concentration is a factor for oxygen supply.Oxygen demand depends on the work being done. The work done is to pump the blood which is in the ventricles preload against the resistance in the aorta afterload.So, myocardial oxygen demand depends onRate- Directly proportionalContractility- Directly proportionalIntramyocardial tension- Directly proportionalAfter load- Directly proportionalPreload- Directly proportionalWall thickness- Inversely proportional 