Cardiovascular/Heart (ch.18) Pt 3

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23 Terms

1
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What is SYSTOLE?
The period of heart contraction.
2
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Define DIASTOLE.
The period of heart relaxation.
3
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What does the CARDIAC CYCLE refer to?
Blood flow through the heart during one complete heartbeat.
4
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What follows atrial systole and diastole in the cardiac cycle?
Ventricular systole and diastole.
5
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What do the mechanical events of the heart follow?
Electrical events seen on ECG.
6
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What is the resting period of the heart called after complete diastole?
Quiescent period.
7
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During which phase does 80% of blood passively flow into ventricles?
Ventricular filling phase.
8
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What triggers atrial systole?
Atrial depolarization (P WAVE).
9
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What is END DIASTOLIC VOLUME (EDV)?
Volume of blood in each ventricle at the end of ventricular diastole.
10
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What causes the opening of the semilunar valves?
When ventricular pressure exceeds pressure in large arteries.
11
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What is the FIRST HEART SOUND referred to as?
The 'lub sound' caused by the closing of AV valves.
12
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What is the volume of blood remaining in each ventricle after systole called?
End Systolic Volume (ESV).
13
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What happens during the isovolumetric relaxation phase?
Ventricles relax and pressure drops, causing semilunar valves to close.
14
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What is the SECOND HEART SOUND referred to as?
The 'dub sound' caused by the closing of semilunar valves.
15
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What is the term for the rebound of blood pressure after the aortic valve closure?
Dicrotic notch.
16
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How many times does the heart beat per minute on average?
About 75 times per minute.
17
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Approximately how long does one cardiac cycle last?
About 0.8 seconds.
18
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How long does atrial systole last?
About 0.1 seconds.
19
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What pressure does the aorta typically reach during ventricular ejection?
About 120 mm Hg.
20
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How does blood flow move through the heart?
By pressure changes and pressure gradients.
21
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What are the pressure readings for the pulmonary artery?
24 / 10 mm Hg.
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What are the pressure readings for the aorta?
120 / 80 mm Hg.
23
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Put the phases of the cardiac cycle in the correct order, starting after ventricular filling.

Isovolumetric contraction, Ventricular ejection, isovolumetric relaxation