View the animation below, then complete the quiz to test your knowledge of the concept.
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| 1 | Ventricular systole causes... |
 | A) | blood to flow into the ventricles. |
| B) | blood to flow out of the atria. |
| C) | the atrioventricular valves to close, and then the semilunar valves to open. |
| D) | the semilunar valves to close, and then the atrioventricular valves to open. |
| E) | pressure to become greater in the aorta and pulmonary trunk than in the ventricles. |
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| 2 | When the pressure in the ventricles becomes lower than the pressure in the atria... |
| A) | the ventricles contract. |
| B) | blood flows into the pulmonary trunk. |
| C) | blood flows into the aorta. |
| D) | the atrioventricular valves open. |
| E) | the semilunar valves open. |
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| 3 | The steps of the cardiac cycle in sequence are... |
| A) | isovolumic contraction, isovolumic relaxation, ejection, passive ventricular filling, active ventricular filling. |
| B) | isovolumic relaxation, isovolumic contraction, ejection, passive ventricular filling, active ventricular filling. |
| C) | isovolumic contraction, ejection, isovolumic relaxation, passive ventricular filling, active ventricular filling. |
| D) | isovolumic contraction, ejection, isovolumic relaxation, active ventricular filling, passive ventricular filling. |
| E) | ejection, isovolumic relaxation, passive ventricular filling, isovolumic contraction, active ventricular filling. |
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| 4 | The beginning of ventricular systole is when blood flowing back toward the relaxed ventricles causes the semilunar valves to close. |
| A) | True |
| B) | False |
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| 5 | The atria never need to contract due to passive ventricular filling. |
| A) | True |
| B) | False |