Hey future biologist! Ready to dive deep into the world of teeny-tiny lipid bilayers that make life as we know it possible? 🎉

Lipid Bilayers & Cell Membranes

• Think of a membrane as the "security guard" of the cell. It acts like a border, deciding who gets in and who stays out.
• The plasma membrane is the main bouncer for the cell, guarding the entrance between the cell and its environment.
• In more complex cells (eukaryotic ones, to be precise) membranes also make internal partitions.

• So, what makes these security guards so good at their job? Meet the lipid bilayer!
• Imagine a sandwich, but instead of bread and fillings, we have two layers of special fats called phospholipids. This double-layer is the "bread" of the cell membrane.
• Fun fact: The entire thickness of this “sandwich” is super thin, like 10 nanometres or even less. That's about 10,000 times thinner than the width of a human hair! 😲