Cardiac cycle — Flashcards

Activation of β1 receptors in the SA node produces an increase in _____ channel activity, which increases the rate of phase 4 depolarization and thus heart rate

How does aortic pressure change during rapid ventricular ejection?_____

The normal heart sound _____ is loudest at the left upper sternal border

The calcium channels that open during the plateau phase (myocardial action potential) are _____-type channels

What type of action potential occurs in the ventricles, atria, and Purkinje system?_____

What phase of the cardiac cycle begins during the QRS complex on ECG?_____

Phase 4 of the SA node action potential is caused by a slow, mixed Na+/K+ inward current via _____ channels

The heart sound _____ may be audible during isovolumetric relaxation

The _____ refractory period refers to the period in which a second action potential is possible, but requires a greater-than-normal stimulus

How does ventricular pressure change during isovolumetric relaxation?_____