More Amazing!

This is really freaking cool! This is an electronmicrograph of the alveoli in your lungs (the air sacs where the oxygen/carbon dioxide exchange occurs in your body). You can see a big mass (MA) sitting on the lung tissue. That big mass is actually a macrophage, which is a cell produced in your bone marrow that travels around your body and eats invading bacteria. You have a lot of these things crawling around your lungs because you tend to inhale a lot of bacteria. Extending to the bottom-left (your left) of the macrophage is a pseudopod (false foot) and the arrows point to the edges of it. The pseudopod is used by the macrophage to crawl across the surface of the inside of your lungs as it scavenges for invading bacteria to destroy.