Q: What is the effect of adrenaline on the heart?

A Increases the uptake of oxygen by the heart
B Increases the contraction force
C Decreases the myocardial irritability
D Increases the heart rate
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Answer: C

Explanation:

Adrenaline or epinephrine is a hormone produced by the adrenal glands that acts on the sympathetic nervous system to increase heart rate, contractility, and oxygen consumption of the heart. Adrenaline has a positive inotropic effect, which means it increases the force of contraction of the heart. Adrenaline also increases the heart rate, or the number of beats per minute. However, adrenaline does not decrease the myocardial irritability. Rather, it increases the irritability or excitability of the myocardium, which can lead to arrhythmias or irregular heartbeats. Therefore, option (c) is incorrect.

Q: What is the effect of adrenaline on the heart?

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