What is an important function of white blood cells in the body?

White blood cells, also known as leukocytes, play a critical role in the immune system and are primarily responsible for defending the body against infections and foreign invaders. One of their key functions is to ingest and break down damaged cells, pathogens, and debris through a process known as phagocytosis. This function helps to clear out harmful substances and supports the overall health of the tissues by removing materials that could lead to infection or inflammation.

By consuming damaged or foreign materials, white blood cells help to maintain homeostasis and promote healing within the body. This is particularly important during an immune response when the body is fighting off infections or responding to injury, ensuring that the body's tissues remain functional and free from harmful agents.