Cardiac Cycle Flashcards Preview

Bio 1: Lifestyle, Health and Risk > Cardiac Cycle > Flashcards

Flashcards in Cardiac Cycle Deck (12)
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1

What are the 3 steps of the cardiac cycle?

- Atrial Systole
- Ventricular systole
- Cardiac diastole

2

What happens in atrial systole? 6

- Atria fill with blood
- Pressure in atria is higher than in ventricles
- AV valves pushed open
- Atria contract simultaneously
- Forces remaining blood into ventricles
- SL valves close

3

In atrial systole are the AV valves open/closed?

Open

4

In atrial systole is the pressure higher in atria/ventricles?

Atria

5

In atrial systole are the semi lunar valves open/closed?

Closed

6

What happens in ventricular systole? 8

- Atria relax
- Ventricles contract after slight delay
- Decreases their blood volume
- Pressure is higher than in atria
- AV valves shut
- Pressure in ventricles higher than in pulmonary artery and aorta
- SL valves open
- Blood flows into aorta and pulmonary artery

7

In ventricular systole are the AV valves open/closed?

Closed

8

In ventricular systole are the SL valves open/closed?

Open

9

In ventricular systole is the pressure higher in the ventricles/atria?

Ventricles

10

What happens in cardiac diastole? 4

- Ventricles and atria both relax
- Higher pressure in pulmonary artery and aorta
- SL valves close to prevent backflow into ventricles
- Atria start filling again b/c higher pressure in pulmonary vein and vena cava

11

In cardiac diastole are the AV valves open/closed?

Open

12

In cardiac diastole are the semi lunar valves open/closed?

Closed