🧫 Transport Across the Cell Membrane

What is the main characteristic of Passive Transport?

It requires no energy (no ATP used), and molecules move down their concentration gradient (from high to low concentration).

What types of molecules are transported via Simple Diffusion?

Small, nonpolar molecules or lipid-soluble substances, such as CO2, O2, and steroids.

Describe the process of Osmosis.

A special case of diffusion where water moves across a semipermeable membrane from an area of high water concentration to low water concentration, helping to maintain proper cell turgor balance.

What is a key takeaway regarding Passive Transport for exams?

It requires no energy. It includes simple diffusion (for small nonpolar molecules) and osmosis (for water).