Large molecules in/out of cells

Endocytosis is the transport of macromolecules – large particles – and small cells into eukaryotic cells

It occurs through engulfment, and vesicle formation, from the cell membrane.

Here you can see packets leaving an organelle (9ER), and merging with Golgi. You see it becoming part of the Golgi through endocytosis.

From Biotech Review YouTube channel.

Phagocytosis and pinocytosis are types of endocytosis.

In receptor-mediated endocytosis, a specific receptor protein on the plasma membrane binds to a particular macromolecule.

In exocytosis, materials in vesicles are secreted from the cell when the vesicles fuse with the plasma membrane.

Here we see a large cell engulfing a smaller cell through endocytosis.

This animation from http://goat-soap.tumblr.com/post/76766233310/booming-voicethe-powerhouse-of-the-cell