Emergency Medical Technician (EMT) Practice Test

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Prepare for the EMT Test with multiple-choice questions and explanations. Study with flashcards and access detailed resources to enhance your knowledge. Get set for a successful exam experience!

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What is the primary cause of myocardial ischemia?

Insufficient blood volume
Decreased oxygen concentration
Insufficient fuels reaching heart cells
Excessive heart rate

The correct answer is: Insufficient fuels reaching heart cells

Myocardial ischemia occurs when there is a lack of sufficient blood flow to the heart muscle, which leads to a decrease in the delivery of oxygen and nutrients necessary for the heart to function effectively. The correct answer focuses on the need for adequate energy sources—specifically, the fuels reaching heart cells. When talking about fuels, we often refer to oxygen and glucose, which are critical for the production of energy in the heart muscle cells. If these resources are inadequate, the heart cells cannot perform their functions properly, leading to ischemia. This is particularly relevant in conditions such as coronary artery disease, where blood flow is restricted due to narrowed arteries. In contrast, while insufficient blood volume, decreased oxygen concentration, and excessive heart rate can contribute to or be associated with heart issues, they do not directly address the underlying issue of fuel delivery to the heart cells that results in myocardial ischemia. The primary cause hinges on the inadequacy of blood supply carrying critical nutrients and energy sources like oxygen, which is essential for maintaining cardiac function and muscle health.