You can stop wondering about those mysterious keyboard function keys on the top of your laptop and desktop keyboards. We have the answers!

Cell Energy and Cell Functions Cells manage a wide range of functions in their tiny package — growing, moving, housekeeping, and so on — and most of those functions require energy.

As a central part of the circulatory system, the heart is primarily responsible for pumping blood and distributing oxygen and nutrients throughout the body.

The pituitary gland plays a role in regulating the functions of other endocrine glands and maintaining blood hormone levels.