AEMCA Practice Exam

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

1. Neutrophils

2. Lymphocytes

3. Eosinophils

4. Thrombocytes

The correct answer is: Thrombocytes

Thrombocytes, also known as platelets, are not classified as a type of white blood cell. Instead, they are essential components of blood involved in the clotting process, helping to prevent excessive bleeding when injuries occur. In contrast, neutrophils, lymphocytes, and eosinophils are indeed types of white blood cells, each playing critical roles in the immune system. Neutrophils are the first responders to infections, particularly bacterial infections, and they help initiate the inflammatory response. Lymphocytes are crucial for the adaptive immune response, with T cells and B cells being key players in recognizing and fighting pathogens. Eosinophils are primarily involved in combating parasitic infections and play a role in allergic reactions. Understanding the distinctions among these cells is fundamental in comprehending how the body's immune response functions.