Regarding the cardiac cycle at resting HR, when in the cycle does ventricular filling occur? How important is atrial contraction to the EDV? Why is the first part of ventricular contraction isovolumetric? When and why does rapid ejection of blood from the ventricle occur?

In a cardiac contractile cell what is the mechanism involved in the change in membrane potential? Depolarization: P wave Repolarization: QRS Complex, Hyperpolarization: T wave Pacemaker: K+ and Na+ flow, Depolarization: Pca rises Repolarization: Pk rises Depolarization: Pna increases, Peak: Na channels close, Plateau: Calcium channels close & Potassium channels open, Repolarization Potassium flows out & Calcium flows in Pacemaker: K+ and Na+ flow, Depolarization: Pca rises Repolarization: Pk rises, 4. If channels close Depolarization: Pna increases, Peak: Na channels close, Plateau: Calcium channels open & Potassium channels close, Repolarization Potassium flows out & Calcium flows out

The entry of calcium into a ventricular muscle cell helps to maintain depolarization of the membrane during the plateau phase of the action potential, but this calcium also performs what other function?

Which formula correctly expresses cardiac output (O) through the end-diastolic volume of the ventricle (V), ejection fraction (E) and heartbeat rate (R)?           O = VER       O = VE/R           O = VR/E       O = RE/V

Describe the cardiac cycle and the relationship amongthe contraction of each of the chambers, the opening andclosing of valves, the pressure in each of the chambers,the phases of the electrocardiogram, and the heartsounds.

What role does the AV nodal delay play in normal cardiac function?

Describe the conditions at the sarcolemma of cardiac muscle cells at rest.

What are the Events in Myocardial action potential? And what do they do?

During which phase of the cardiac cycle do the ventricles begin to contract while the semilunar valves remain closed ? Group of answer choices Isovolumetric contraction Ventricular ejection Ventricular filling

Describe isovolumetric ventriclar contraction in five steps