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level: The heart

Questions and Answers List

level questions: The heart

QuestionAnswer
Describe the cardiac cycle1) ventricles diastole and atrium systole 2) ventricle systole and atrium diastole 3) ventricle diastole and atrium diastole 4) whole process start again
Explain what happens when ventricles relax and atrium contract- volume decreases and pressure increases in the atrium - this pushes blood into the ventricles through the atrioventricular valves - there's a slight increase in ventricular pressure and volume
Explain what happens when ventricles contract and atrium relax- volume decreases and pressure increases in the ventricles - pressure becomes higher in ventricles than in atria, which forces atrioventricular valves shut to prevent back flow - the high pressure opens the semi lunar valves and blood is forced through the pulmonary artery and aorta
Explain what happens when ventricles relax and atrium relax- the high pressure in the pulmonary artery and aorta causes the semi lunar valves to close - the atria fills with blood due to high pressure in the vena cava and pulmonary vein
What is systolecontraction
What is diastolerelax