Table of Contents

• Prequiz...
• Fick's Laws, Part II
• 1: Fick's Second Law ...
• 2: ... is about "time to diffuse"
• 3: A Very Useful Formula
• 4: Time-to-diffuse increases dramatically
• 5: General Functions and Diffusion
• Biological Applications
• 6: Biological Applications
• 7: Why do rhinos have lungs and amoebas don't?
• 8: Diffusion is efficient in small organisms, but not big ones
• 9: Why we have lungs
• 10: How many macrophages does it take to kill a virus?
• 11: You need a lot of macrophages - or one smart one!
• Review
• 12: Summary

Biological Applications

So how does this really apply to biology??? Does it apply to biology at all??

We offer two examples of how the equations and mathematical approaches can help us understand biological concepts. First, we talk about why rhinos (and other vertebrates) have lungs, then we show how we can use maths to determine how quickly we can fight off a cold.