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Transcript for Exocytosis & Endocytosis

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Time Content
00:02 → 00:08

This is a cell that secretes large molecules that are unable to pass through the lipid bilayer of the plasma membrane.

00:10 → 00:14

They leave the cell instead by a process known as exocytosis.

00:19 → 00:24

After production in a system of membranes called the endoplasmic reticulum,

00:24 → 00:28

the molecules are packaged in a small sack of membrane called a vesicle.

00:28 → 00:33

The vesicle moves to a stack of membranes called the Golgi apparatus.

00:33 → 00:38

Their membranes merge, and the vesicle releases its contents for modification.

00:42 → 00:48

As the molecules leave the Golgi apparatus, they are again packaged in a vesicle, which moves to the plasma membrane.

00:49 → 00:56

As membranes merge again, the contents leave the cell without actually crossing the plasma membrane.

01:05 → 01:10

This process can also occur in reverse, allowing large molecules to enter a cell.

01:10 → 01:13

This is termed endocytosis.