Regarding the function of the heart:

• A. at increased heart rates, diastole is shortened more than systole
• B. the pericardial sac normally contains about 50ml of fluid
• C. during the cardiac cycle, left ventricular ejection begins before right ventricular ejection
• D. during expiration, the aortic valve closes before the pulmonary valve
• E. the end diastolic ventricular volume is about 170ml