Endomembrane system
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ENDOMEMBRANE SYSTEM. The Endomembrane System. The endomembrane system consists of: Nuclear envelope Endoplasmic reticulum Golgi apparatus Vesicles Plasma Membrane. Nucleus and nuclear envelope. ENDOMEMBRANE SYSTEM. Endomembrane system, I -ER. Continuous with nuclear envelope

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ENDOMEMBRANE SYSTEM

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Endomembrane system

ENDOMEMBRANE SYSTEM


The endomembrane system

The Endomembrane System

  • The endomembrane system consists of:

  • Nuclear envelope

  • Endoplasmic reticulum

  • Golgi apparatus

  • Vesicles

  • Plasma Membrane


Nucleus and nuclear envelope

Nucleus and nuclear envelope


Endomembrane system1

ENDOMEMBRANE SYSTEM


Endomembrane system i er

Endomembrane system, I -ER

  • Continuous with nuclear envelope

    TWO TYPES

  • Smooth ER

  • Rough ER


Smooth endoplasmic reticulum

Smooth Endoplasmic Reticulum

Smooth ER

  • Lacks significant number of ribosomes on external surface.

    Functions:

  • Makes lipids, phospholipids, and steroids.

  • Detoxifies poisons and toxins

  • Stores Ca+2 in muscle cells

  • Metabolism of Carbohydrates

  • Produce vesicles which contain newly produced proteins.


Rough endoplasmic reticulum

Rough Endoplasmic Reticulum

  • Cytoplasmic side is covered with ribosomes

  • Further manufactures and processes proteins from ribosomes destined to become secretory proteins (enzymes, hormones).

  • Makes phospholipids and embeds proteins in them: making new cell membrane.


Endomembrane system2

ENDOMEMBRANE SYSTEM


Endomembrane system ii golgi

Endomembrane system, II - Golgi

• ER products are modified, stored, and then shipped

  • Made of flattened saccules (cristernae) of membrane.

  • cis face (receiving) & transface (shipping)

  • Creating vesicles


Golgi apparatus

Golgi Apparatus


Golgi apparatus post office

Golgi Apparatus – “Post Office”


Export products of golgi apparatus have three possible fates

Export products Of Golgi Apparatus have three possible fates:

1. To extracellular environment.

2. Vesicles converted into:

Lysosomewhich stores hydrolytic enzymes. Used to attack pathogen or break down dead or damaged cell. Cell recycler of the cell’s own organic material.

Peroxisomeswhich store enzymes involved in peroxide metabolism.

3. Add more plasma membrane to the cell to facilitate growth.


Endomembrane system

LYSOSOMES AND PEROXISOMES


Endomembrane system3

ENDOMEMBRANE SYSTEM


The cell membrane

The Cell Membrane

  • “The gatekeeper of the cell”

  • A thin, outer covering of the cell.

  • Controls what goes in and out of cell.


Exocytosis

EXOCYTOSIS


Drama time endomembrane system

DRAMA TIMEEndomembraneSystem

FEATURING:

  • Nuclear envelope

  • Endoplasmic reticulum

  • Golgi apparatus

  • Vesicles

  • Plasma Membrane


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