1. Passive Transport: This type of transport does not require energy from the cell. Instead, it relies on the laws of physics, specifically diffusion and osmosis.
* Diffusion: Movement of molecules from an area of high concentration to an area of low concentration.
* Osmosis: The movement of water across a semipermeable membrane from an area of high water concentration to an area of low water concentration.
2. Active Transport: This type of transport requires energy from the cell, usually in the form of ATP. It moves molecules against their concentration gradient, meaning from an area of low concentration to an area of high concentration.
* Protein pumps: These proteins use energy to move specific molecules across the cell membrane.
* Endocytosis and exocytosis: These processes involve the cell membrane engulfing or releasing large particles or molecules.
Let me know if you'd like more detail on any of these methods!
