Fourth Phase Flashcards
1
Q
What is the fourth phase?
A
Isovolumetric relaxation
2
Q
What happens in the chambers in the fourth phase?
A
Atria relax and ventricles relax
3
Q
What happens to the pressure in the fourth phase?
A
Atrial pressure decreases and arterial trunk pressure increases
4
Q
What happens to the valves in the fourth phase?
A
AV valves closed and semilunar valves closed
5
Q
What else happens in fourth phase?
A
Semilunar valves closing causes ‘dub’ sound
