JBL EMT Practice Exam

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Prepare effectively for the JBL EMT Exam with our interactive quiz filled with insightful questions and detailed explanations. Build your knowledge and confidence to pass the EMT certification.

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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.