Gas Exchange - Your Body's Oxygen Delivery System
Your lungs are basically amazing gas-swapping machines that work non-stop to keep you alive. Gas exchange happens in tiny air sacs called alveoli, where oxygen rushes into your blood whilst carbon dioxide gets kicked out.
These alveoli are perfectly designed for their job. Their thin walls mean gases don't have far to travel, and their permeable walls let gases slip through easily. Plus, they're surrounded by loads of blood vessels to quickly carry that fresh oxygen around your body.
Plants do something similar but in their spongy mesophyll - the spongy bit inside leaves. Air spaces between these cells increase the surface area, making gas exchange much more efficient.
Quick Tip: Think of alveoli like tiny balloons covered in blood vessels - perfect for swapping gases quickly!
