Cardiac Cycle Flashcards
The 7 stages of the cardiac cycle
- Atrial contraction
- Isovolumetric contract
- Rapid filling
- Reduced filling
- Isovolumetric relax
- Rapid filling
- Reduced filling
Other name for tricuspid valve?
Atrioventricular valve
Other name for pulmonary valve?
Semilunar valve
Other name for mitral valve?
Biscuspid valve (left atrioventricular)
Other name for aortic valve?
Semilunar valve (left)
Define End Diastolic Volume
What is it also known as?
volume of blood in ventricle just prior to systole
Preload
Define End Systolic Volume
volume of blood remaining in ventricle at the end of
systole
Define the Frank - Starling Law
The force of contraction of the ventricular muscle is
proportional to the end diastolic volume (preload)
Discuss the Frank - Starling Law with respect to sliding filament theory
As the ventricles fill, the myocardium stretches to accommodate This stretch increases the potential interactions between actin and myosin filaments More interactions (cross-bridges) = more force can be generated
Stroke volume formula?
Definition?
EDV - ESV
The amount of blood pumped by the left ventricle in one HB
Cardiac output formula?
HR x SV
Discuss the baroreceptor reflex
Baroreceptors sense a change in blood pressure by monitoring arterial wall tension
Deliver this change by stimulating the Cardiovascular centre in the medulla oblongata
If increased blood pressure is detected, the CV centre triggers a parasympathetic response in order to decrease cardiac output, resulting in a reduced blood pressure, homeostasis is restored
Vice versa
