Reproductive Physiology — Practice
An electrophysiology study shows that a drug selectively blocks the funny current (If) in the sinoatrial node. The most direct physiological consequence is a change in which phase of the SA nodal action potential?
AThe amplitude of phase 0 upstroke
BThe rate of phase 4 slow diastolic depolarisation
CThe duration of the phase 2 plateau
DThe magnitude of phase 3 repolarisation