Flashcards in 2. The Heart As A Pump Deck (8)
What is the difference between capacitance vessels and resistance vessels?
- in arterial system - high pressure
- restrict blood flow to drive supply to hard to perfuse areas of the body
- 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
- 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?
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