Emergency Medical Technician (EMT) Intermediate Practice Exam

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Prepare for the Emergency Medical Technician (EMT) Intermediate Test with focused study methods including flashcards and multiple-choice questions. Practice with hints and detailed explanations to boost your readiness for the exam.

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Which of the following is NOT a type of white blood cell?

Lymphocyte
Neutrophil
Histamine
Eosinophil

The correct answer is: Histamine

The correct answer is based on the understanding of blood components and their specific roles. Lymphocytes, neutrophils, and eosinophils are all types of white blood cells (leukocytes) that play critical roles in the immune system. Lymphocytes are vital for specific immune responses and can be further classified into B cells and T cells, which are essential for antibody production and cellular immunity, respectively. Neutrophils are the most abundant type of white blood cells and are key players in the body's defense against infections, particularly bacterial infections. Eosinophils are primarily involved in combating parasitic infections and play a role in allergic reactions. Histamine, on the other hand, is not a white blood cell but rather a chemical mediator released by mast cells and basophils. It plays a crucial role in inflammatory responses and allergic reactions but does not function as a cell itself. Understanding the distinct roles and categories of blood components is essential for comprehending how the immune system operates and how different cells contribute to overall health.