mpworksheet6 - Kim Chun [email protected] Thursday 8 am...

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Kim Chun [email protected] , Thursday 8 am BIPN 100 Cardiac Cycle 1. Heart is relaxed, so blood flows from the veins (vena cavae) into the right atrium, and from the pulmonary veins into the left atrium. a. Diastole= when the pressure in the atria is ___________(greater/smaller) than the pressure in the ventricles, the AV valves open and blood fills the ventricles. 2. At the end of diastole, the SA node depolarizes, depolarizing the atria and the atria contract. This tops off ventricles with blood. 3. As pressure in the ventricles begins to increase, and ventricles start to contract, the blood is pushed back into the atria. a. However, the ______ valves close, which causes the first heart sound. b. Ventricles become closed chamber because both the _______ valves and ______________ valves are closed huge increase in pressure because can’t move a load= _____________ contraction. 4. The moment that pressure in the ventricles exceeds pressure in the arteries, the __________ valves open and blood ejects into the arteries. 5. When ventricles begin to relax, the pressure in the ventricles begins to drop. a. Pressure drops the moment that ventricular pressure is __________ (less/higher) than that in the arteries, the arterial valves __________ (open/close) Pressure-Volume graph: Label the above points (A-D) with what is happening at each point. Where would ESV and EDV be located on the graph? What is the pre-load and the after-load and where would it be located on the graph? First heart sound= when pressure of the ventricle increases more than the atria to close AV valves at the beginning of systole.
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2 nd heart sound= at the end of systole when the pressure in the ventricles is less than the arteries, the arterial valves closes. Diastole occurs between the _________ (1 st /2 nd ) and ___________ (1 st /2 nd ) heart sounds. Systole occurs between the _________ (1 st /2 nd ) and ___________ (1 st /2 nd ) heart sounds. Why is arterial hypertension dangerous? *Know Wigger’s Diagram (take ECG and ask what is happening when atria is depolarized, the pressure in the ventricles and aorta, and the volume in the ventricles): Figure 14-26! Heart has two circuits in series: ____________ circulation= receives venous blood from capillaries and then sends it to lungs. o Low resistance: 25 mmHg during systole ____________ circulation= receives blood from lungs and then sends it to the rest of the body. o High pressure and resistance: 120 mmHg Each ventricle pumps the same amount of blood per unit time. o *Cardiac output of left ventricle= cardiac output of right ventricle What happens if the right ventricle pumps more? (be specific) What happens if the left ventricle pumps more? (be specific) Frank-Starling’s Law of the Heart= input of the heart is the same as the amount of blood being pumped out of the heart.
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