Concept:Diagram Z represents alveoli, which are tiny air sacs in the lungs where gas exchange occurs.Explanation:Air enters the lungs through branching tubes called bronchioles.These tubes end in clusters of microscopic air sacs known as alveoli.Alveoli are located in the terminal region of the lungs.Therefore, the part from which diagram Z is taken is the end section labelled V.Answer:D. V
