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1. Electrical events of the heart dictate ______mechanical_______ events of the heart. a. Depoolarization causes ___Contraction________________________ . b. 2. Repolarization causes ______Relaxation______________________ .

What two factors determine the direction of blood flow through the heart? Valves and pressure gradients (Pressure is generated by contraction of cardiac muscle) List the chambers/vessels that the four valves connect: Chamber Valve Pulmonary Semilunar Aortic Semilunar Mitral (bicuspid) Tricuspid Chamber/Vessel Pulmonary Artery Aorta Pulmonary Vein Inferior/superior Vena Cava

3.

Right Ventricle Left Ventricle Left Atrium Right Atrium 4.

a. What are the two phases that contribute to ventricular filling? Atrial ___Systole____________ and Ventricular ________Diastole_________ b. Blood flows through the _____Mitral_____________ or ______Tricuspid_____________ valves into the ventricles.

5. 6.

During Ventricular Systole, what closes the AV valves?

Intraventricular pressure increases and causes ventricular contraction
During Ventricular Systole, what opens the semilunar valves?

Ventricles contract which causes the pressure to rise, and then the pressure of the blood forces the semilunar valves to open.
7. 8. 9. During Isovolumetric Relaxation, what closes the semilunar valves?

When blood pressure in arteries is greater than blood pressure in ventricles
During Isovolumetric Relaxation, what opens the AV valves?

When blood pressure in ventricles is greater than blood pressure in arteries
Why is hypertension hard on the heart? Hypertension is a state of constantly high blood pressure (greater than 140/90 mmhg), so this causes the heart muscles to become thicker, and makes the heart work harder to pump blood. Over time, this can become a difficult task.

10. ml?

Looking at the ventricular volume graph, the stroke volume is

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