Cardiac Cycle
The TP segment can be characterized in the cardiac cycle as this.
What is ventricular diastole/relaxation
The amount of blood that leaves the heart per beat/contraction.
What is stroke volume?
The cells that depolarize by themselves with the opening of sodium funny channels.
What are pacemaker cells?
The normal pacemaker of the heart.
What is the sinoatrial node?
Calcium from the L-type channels cause the SR of cardiac muscle to export calcium for contraction.
What is calcium induced-calcium released?
A major increase in ventricular volume coupled with no change in volume.
What is isovolumetric contraction
The amount of blood that leaves the heart per minute.
What is cardiac output?
What are gap junctions?
20-40 APs/minute.
What is the rate of depolarization of purkinje fibers?
The graph that ties together volume, pressure changes and electrical activity within the heart.
What is the cardiac cycle?
What is volume decreases?
Heart Rate x Stroke Volume
-90mV
What is RMP of contractile cells?
When these SA node is not firing, this is the result in the EKG.
What is an absent P wave?
The route in which the right atria depolarizes the left atria.
What is the interatrial septum/pathway?
The sharp increase in ventricular volume at the end of atrial systole.
What is atrial kick?
An increase in EDV leads to this.
What is an increase in stroke volume and cardiac output?
A prolonged positive period of contractile cell electrical activity attributed to slow release of calcium through L-type channels (VG).
What is the plateau phase?
The "holding" of APs in the conduction system to allow for the ventricles to fill.
What is AV nodal delay?
Vagal innervation of the SA node which causes a change in heart rate.
What is parasympathetic stimulation of the heart?
This is the area of the cardiac cycle when aortic pressure slightly increases after ventricular diastole and then pressure decreases gradually.
What is the dicrotic notch?
An increase in EDV causes a greater stretch within the heart for a more forceful ejection.
What is Frank-Starling's Law of the heart?
What is the refractory period?
What is ventricular fibrillation?
When the majority of coronary circulation occurs within the heart.
What is ventricular diastole?