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Flashcards in 2. The Heart As A Pump Deck (8)
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What is the difference between capacitance vessels and resistance vessels?

Resistance vessels
- in arterial system - high pressure
- restrict blood flow to drive supply to hard to perfuse areas of the body

Capacitance vessels
- in venous system - low pressure
- enable system to vary amount of blood pumped around body (act as blood store)


What are the 2 types of cardiovascular circulations and what is the pressure like in each?

- pulmonary circulation: low pressure
- systemic circulation: high pressure


Describe the typical pressures in the heart chambers as in the aorta and pulmonary artery

In mmHg
- RA = 4
- RV = 25 systole/3 diastole
- pulmonary artery = 25 systole/10 diastole
- LA = 10
- LV = 120 systole/9 diastole
- aorta = 120 systole/80 diastole


What are systole and diastole?

- Systole = contraction & ejection of blood from ventricles
- Diastole = relaxation & filling of ventricles


What is the stroke volume at rest?

70 ml/beat


name the 4 valves of the heart

- Triscupid valve (RA to RV)
- Pulmonary valve (RV to pulmonary artery)
- Mitral valve (LA to LV)
- Aortic valve (LV to aorta)


what determines whether heart valves are open/closed?

differential blood pressure on each side


what prevents the inversion of mitral/tricuspid valves on systole?

leaflets are attached to papillary muscles via chordae tendinae