Which of the following is NOT an effect of adrenaline on the heart?

Show Answers

Elevates the heart rateReduces the heart muscle's excitabilityEnhances the strength of heart contractionsBoosts the heart's oxygen consumption

Explanation

Adrenaline increases heart rate, strengthens the force of contractions, and raises oxygen consumption by the heart. However, it does not decrease myocardial irritability; instead, it typically increases it.