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

Conduction velocity is increased when the space (length) constant is _____

Increased RV ejection time during inspiration causes delayed closure of the _____ valve (normal splitting)

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?_____

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

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

Blood flows continuously through the cardiac cycle in all organs except the _____

How does ventricular pressure change 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