The effects of Adrenaline on heart are all except__________________?
Correct answer: B. Decreases myocardial irritability
- A. Increases heart rate
- B. Decreases myocardial irritability
- C. Increases force of contraction
- D. Increases oxygen uptake by heart
Explanation
Adrenaline increases heart rate, myocardial contractility, and cardiac oxygen consumption through predominantly beta-1 effects. It increases, rather than decreases, myocardial excitability or irritability.
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