JBL EMT Practice Exam

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Prepare for the JBL EMT Exam and improve your chances of success. Study with our flashcards, multiple-choice questions, hints, and explanations. Get exam-ready!

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The ability of cardiac muscle cells to contract spontaneously without a stimulus from a nerve source is called:

automaticity
contractility
excitability
impulsivity

The correct answer is: automaticity

Cardiac muscle cells have the unique ability to contract spontaneously without the need for external stimulation from nerve sources. This is known as "automaticity", making option A the correct answer. Option B, contractility, refers to the ability of cardiac muscle cells to contract in response to a stimulus. Option C, excitability, refers to the ability of cardiac muscle cells to respond to a stimulus. Option D, impulsivity, is not a term used to describe the properties of cardiac muscle cells. Therefore, option A is the most accurate choice for this question.