Endocytosis is a process in which a cell surrounds a substance outside of the cell by extending its cell membrane and cytoplasm and then takes it into the cell. Amoeba do this in order to feed on bacteria and other tiny organisms. Certain white blood cells also do this in order to rid the body of pathogens.
It is similar to diffusion. It is when a cell's membrane engulfs a particle and the remaining part of the membrane turns into a vacuole around the particle. This occurs when the particle is too large to diffuse into the cell on its own.
Passive transport (does not require ATP energy): osmosis, diffusion, facilitated diffusionActive transport (requires ATP energy):*primary active transport, e.g. sodium potassium pump, calcium pump, proton pump*secondary active transport, e.g. in ATP synthase*edocytosis and exocytosis
It is similar to diffusion. It is when a cell's membrane engulfs a particle and the remaining part of the membrane turns into a vacuole around the particle. This occurs when the particle is too large to diffuse into the cell on its own.
Passive transport (does not require ATP energy): osmosis, diffusion, facilitated diffusionActive transport (requires ATP energy):*primary active transport, e.g. sodium potassium pump, calcium pump, proton pump*secondary active transport, e.g. in ATP synthase*edocytosis and exocytosis