👉 A giant cell is a type of cell that has a diameter greater than 100 micrometers. They are found in the blood, cartilage, and bone, where they play important roles in maintaining homeostasis, healing injuries, and regulating blood flow. Giant cells can also be found in other tissues such as adipose tissue, which is fat deposits stored in the body. Giant cells have a thick, white membrane called an extracellular matrix that supports their function.