What is a neutrophil?

A neutrophil is a type of leukocyte, or white blood cell, that plays a critical role in the immune response. Specifically, neutrophils are known for their ability to readily stain with neutral dyes, which is why option B is correct. This characteristic helps in identifying and differentiating neutrophils from other types of white blood cells under a microscope. They are essential for fighting off infections, particularly bacterial infections, due to their role in phagocytosis, where they engulf and digest pathogens.

The other choices do not accurately describe neutrophils. Red blood cells are primarily responsible for oxygen transport, while platelets play a key role in blood clotting. Hormones produced by the pancreas, such as insulin, are involved in regulating blood sugar levels but are unrelated to the immune functions of neutrophils. Understanding the specific function and nature of neutrophils enhances comprehension of the body's immune system and the various cellular components involved in defending against disease.