Certified Cardiographic Technician (CCT) Practice Exam 2026 – Your All-in-One Guide to Exam Success!

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What effect does adrenaline have on heart rhythm?

It decreases heart rate and contractility

It has no effect on heart rhythm

It can increase heart rate and contractility

Adrenaline, also known as epinephrine, is a hormone that plays a significant role in the body's fight-or-flight response. When released into the bloodstream, it acts on the heart to increase both the heart rate and the contractility of cardiac muscle. This means that adrenaline enhances the heart’s ability to pump blood more forcefully and quickly, which is crucial during situations that require the body to respond fast.

The increase in heart rate occurs as adrenaline stimulates the beta-adrenergic receptors in the heart, leading to more rapid electrical impulses from the sinoatrial (SA) node, which is the natural pacemaker of the heart. Additionally, higher levels of adrenaline enhance the force of each heartbeat by improving the efficiency of the heart muscle contractions. This physiological response is necessary to ensure that more oxygen and nutrients are delivered to tissues during times of stress or physical activity.

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It stabilizes irregular heartbeats

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