Transport Across Membranes

4 Mechanisms of transport across membranes

• Diffusion

• Osmosis

• Active Transport

• Bulk Transport

which of those are active/passive

• osmosis and diffusion are passive

• active transport and bulk transport are active

Types of Diffusion

• simple diffusion

• facilitated diffusion (requires a membrane protein)

Types of Osmosis

• simple diffusion

• facilitated diffusion with a specific membrane protein called aquaporin

Types of active transport

• Primary Active transport (energy in ATP)

• Secondary Active transport (energy in conc gradient)

Types of Bulk transport

• endocytosis

• exocytosis