The large cell that engulfs foreign material and worn-out red blood cells is called a macrophage.

Here's why:

* Macrophages are a type of white blood cell that are part of the immune system. They are known for their ability to engulf and destroy pathogens, cellular debris, and other foreign substances through a process called phagocytosis.

* Red blood cells have a limited lifespan (around 120 days) and eventually become worn out. Macrophages are responsible for removing these old red blood cells from circulation.

Let me know if you have any more questions!