In an experiment after a prolonged electrical stimulation of the peripheral nerve vagus a brief cardiac arrest occurred in the subject. What ion mechanisms in the cardiac cells cause this effect?

Answer options

1. Decreased Na+ influx
2. Increased K+ efflux
3. Increased Na+ influx
4. Increased Ca+ influx
5. Decreased K+ efflux

Explanation

In an experiment after a prolonged electrical stimulation of the peripheral nerve vagus a brief cardiac arrest occurred in the subject. What ion mechanisms in the cardiac cells cause this effect?Prolonged vagus stimulation causes K⁺ efflux.