Answer:When air moves down into your lungs, your body starts the process of breathing and gas exchange, which is essential for life. Here's what happens, step by step:---️ 1. Inhalation (Breathing In)You breathe in air through your nose or mouth, and it travels down your:Trachea (windpipe)Then into your bronchi (two tubes leading into each lung)And finally into bronchioles (smaller branches) and into the alveoli--- 2. Gas Exchange in the LungsInside your lungs are millions of alveoli (tiny air sacs), where the real magic happens:Oxygen (O₂) from the air passes through the walls of the alveoli into your bloodstream.At the same time, carbon dioxide (CO₂) (a waste gas) moves out of your blood and into the alveoli to be exhaled.---❤️ 3. Oxygen to the BodyThe oxygen-rich blood is carried to your heart, which pumps it to every part of your body so your cells can use it to produce energy.--- 4. Exhalation (Breathing Out)After your body uses the oxygen, it creates carbon dioxide as waste. You then breathe it out through the same path—alveoli → bronchioles → trachea → nose/mouth.--- In Short:When air goes down into your lungs: ✅ Oxygen goes into your blood Carbon dioxide comes out This keeps your body alive and energized.Let me know if you'd like a drawing or diagram to make it clearer!