Workshop 5 Flashcards
1
Q
Pulmonary arteries
A
heart to lungs
2
Q
Pulmonary veins
A
lungs to heart
3
Q
Coronary arteries
A
- from root of aorta and supplies heart muscle (myocardium)
- ventricular systole occludes coronary flow
- 250mL to 1L per min at exercise
4
Q
Ventricular Diastole
A
atria contract to eject blood into ventricles when relaxed
heart relaxation (80 mmHg)
5
Q
Ventricular Systole
A
ventricles depolarize and contract from apex towards aorta and pulmonary trunk
heart contraction (120 mmHg)
6
Q
Diastole 2 stages
what contributes to atria contraction?
A
- 70-80% of end diastolic volume is passive filling
- 20-30% is atrial contraction top up
7
Q
Isovolumetric Contraction
A
- ventricles begin to contract
- pressure exceeds that in aorta causing SL valves to open
same as ventricular systole
8
Q
Ventricular Ejection
A
- SL valves open and myocardium contract
- aortic and pulmonary pressure exceeds ventricular pressure (SL valves close)
- elastic recoil of aorta causes dicrotic notch
9
Q
Isovolumetric Relaxation
A
- SL valves close
- ventricular pressure still higher than atrial pressure
- blood cannot enter ventricles
- once atrial pressure is higher, blood enters ventricles
occurs around same time as ventricular diastole
10
Q
SA Node
A
- spread electrical impulses across atria
11
Q
Tricuspid/Mitral Valve sides
A
right side and lefet side
12
Q
electrical activity process
parts where signal travels
A
SA node –> AV node –> Bundle of His –> Purkinje Fibres
SA -> AV (atrial contraction into ventricles)
AV -> BoH + PF (ventricula
