PHSL232 Lecture Notes - Lecture 2: Heart Valve, Pulmonary Artery, Cardiac Cycle
Document Summary
Changes in pressure in the ventricles and atria, aorta and veins during diastole and systole. Changes in blood volume in the ventricle, atria, aorta and veins during. Typical values for pressures and volumes in diastole and systole and their units. Concept of timing of these processes in rest and with increasing heart rate. How and when ac and sl valves open and close. How and when the heart sounds can be heard. 70bpm, 100,800 per day, 36,792,000 per year, 2,943,360,000 a lifetime (80 years) 5 minutes would damage your heart and require clinical help. Greater than 10 minutes would be fatal. All cardiac processes: excitation, contraction, relaxation, valves open, valves closed all need to occur at the right time in the right direction- important for normal physiological function. A complete set of contraction and relaxation of the heart. Electrical events: ecg- electrical stimulus and its conduction generates an ecg. Valvular events: heart sounds (closure of valves)
