Endocytosis and Exocytosis

https://www.youtube.com/watch?v=3DRYU8zAAcA

What happens in both exo and endocytosis

Large molecules are transferred across cell membrane

Bulk transport, as they can transfer large quantity of material.

They both require energy, provided by ATP

What happens during endocytosis

Particles or molecules are transported into the cell, this can include large molecules such as proteins.

In first stage, cell membrane folds inwards to form a cavity around the particles (invagination)

The membrane then encircles the particles to form a vesicle

Then the vesicle moves into the cell. and goes to where its required

What is phagocytosis

When solid materials such as bacteria are taken into cells by endocytosis.

What is pinocytosis

When liquids / dissolved solutions are taken into cell by endocytosis.

What happens during exocytosis

Moves material out of the cell (excreted proteins / enzymes)

At start of exocytosis, the proteins are found in golgi apparatus, the proteins are modified here before being secreted.

Vesicles containing the protein bud off the golgi apparatus and make their way towards cell membrane

Vesicles then fuse with cell membrane , and protein secreted