Cardiovascular system Flashcards
1
Q
About the heart
A
- organ about size of fist
- pumps blood round body
2
Q
how many sides does a heart have and what muscle separates them?
A
2 - separated by wall of muscle called septum
3
Q
role of right side of heart
A
- takes deoxygenated blood to lungs
4
Q
role of left side of heart
A
takes oxygenated blood to body
5
Q
Path of oxygenated blood to the body
A
lungs - PV - LA - BV - LV - A - Body (gives up O2, removes CO2)
6
Q
Path of deoxygenated blood to the lungs
A
body - VC - LA - TV - LV - PA - lungs (gives up CO2, saturates O2)
7
Q
how long does diastole last?
A
0.5 seconds - relaxation phase - filling of chambers
8
Q
how long does systole last?
A
0.3 seconds - contraction phase - emptying of chambers
9
Q
Describe diastole
A
- both atria fill with blood - AV valves closed
- Atrial blood pressure rises, forces open AV valves, blood flows passively into ventricles (SL valves closed)
10
Q
Describe systole
A
- both atria contract forcing any remaining blood into ventricles - SL valves stay closed)
- both ventricles contract increasing ventricular pressure
- aorta + pulmonary valves are forced open (AV valves closed)
- blood forced into aorta - travels to body + PA where travels to lungs
