Humans are made up of many types of cells, and these cells have a broad range of sizes. For example, an immune system cell called a neutrophil has a radius of approximately , while a type of connective tissue cell called a fibroblast has a radius of about

Humans are made up of many types of cells, and these cells have a broad range of sizes. For example, an immune system cell called a neutrophil has a radius of approximately $\mathbf{4} \boldsymbol{\mu \mathrm { m }}$, while a type of connective tissue cell called a fibroblast has a radius of about $8 \mu \mathrm{~m}$. \nSurface area of a sphere: $A=\mathbf{4} \boldsymbol{\pi} \boldsymbol{r}^{\mathbf{2}}$\nAssuming both cell types are perfectly spherical, how many times larger is the surface area of a fibroblast compared to the surface area of a neutrophil? $\square$ times