Emergency Medical Technician (EMT) Intermediate Practice Exam

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Study for the EMT Intermediate Exam. Access detailed flashcards and multiple-choice questions that come with hints and explanations. Prepare comprehensively for your EMT certification!

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The percentage of blood pumped from the heart is known as:

Cardiac output
Ejection fraction
Stroke volume
Heart rate

The correct answer is: Ejection fraction

The correct identification of the percentage of blood pumped from the heart pertains to ejection fraction. Ejection fraction is a key measurement used to assess the heart's efficiency, specifically quantifying the proportion of blood that is ejected from the left ventricle during each contraction relative to the total amount of blood present in the ventricle at the end of filling (diastole). It is expressed as a percentage and is crucial in evaluating heart function, particularly in conditions such as heart failure. While cardiac output represents the total volume of blood pumped by the heart per minute and is influenced by both stroke volume and heart rate, it does not convey the percentage of blood ejected with each heartbeat. Stroke volume refers to the amount of blood pumped from the left ventricle with each contraction, while heart rate indicates the number of beats per minute. However, none of these measures describe the fraction of blood that is actively ejected during a single heart contraction, which is why ejection fraction is the specific term that answers the question.