Which of the following cell types is classified as a leukocyte involved in the immune response?

• A. Adipocyte
• B. Erythrocyte
• C. Hepatocyte
• D. Neutrophil

Answer: (D)

Verified step by step guidance

1. Step 1: Understand the term 'leukocyte.' Leukocytes, also known as white blood cells, are cells involved in the immune response. They help defend the body against infections, foreign invaders, and abnormal cells.
2. Step 2: Review the cell types listed in the question. Adipocytes are fat storage cells, erythrocytes are red blood cells responsible for oxygen transport, and hepatocytes are liver cells involved in metabolism and detoxification. None of these are leukocytes.
3. Step 3: Learn about neutrophils. Neutrophils are a type of leukocyte and are part of the innate immune system. They are the first responders to microbial infections and play a key role in inflammation and phagocytosis (engulfing and destroying pathogens).
4. Step 4: Compare neutrophils to the other cell types listed. Neutrophils are the only cell type among the options that are classified as leukocytes and directly involved in the immune response.
5. Step 5: Conclude that neutrophils are the correct answer based on their classification as leukocytes and their role in the immune system.