Since each breath exchanges not only the air in the lungs but also the air in the dead space, the volume of air, in liters, that reaches the alveoli is found by subtracting _____ from _____. This is called _____.

3000+ review questions on anatomy and physiology. 

Anatomy refers to the internal and external structures of the body and their physical relationships, whereas physiology refers to the study of the functions of those structures.