Endocytosis, Phagocytosis, Pinocytosis and Exocytosis definitions PDF

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Endocytosis, Phagocytosis, Pinocytosis and Exocytosis definitions...

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Membranes    

The bigger the cell, the more effort it requires for things to come in and out. Eggs are single celled Nerve cells, are long and thin, surface area is large Increase surface area to volume ratio.

Surfaces of cells:  Phosphate lipids: tail is insoluble , head is soluble.  Phospholipid bi layer. Cell membranes are differentially permeable  Charged molecules are not soluble outside of the cell?  Gas Diffusion: Osmosis: Endocytosis Exocytosis Slide 21: Endocytosis, Phagocytosis and pinocytosis:

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Endocytosis is a general term for a cell consuming something.

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Phagocytosis: when a cell is eating something eg. Old blood cell. (to keep it's nutrients This creates a vacuole. 

Pinocytosis: when a cell is drinking a fluid, creates a vesicle. Exocytosis: molecules or particles leaving the cell.

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The Rough Endoplasmic Reticulum produces proteins and delivered by vesicles to the Golgi Apparatus.

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The Golgi Apparatus then further processes and modifies the proteins.

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Then turns into a vesicle called Lysosomes.

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Then the Lysosomes makes it way to the outer membrane.

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The membranes of the lysosomes is going to merge with the membranes of the outer wall cell, doing so it releases the contents to the outside of the cell.

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Note: Vesicles are moved by moto proteins on the microtubules

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Note: Cell plasma membrane is made of phospholipid bilayer

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Note: Members of the organelles also have a phospholipid bilayer

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NOTE! IMPORTANT: the vesicles moving from Rough Endoplasmic Reticulum to the Golgi body Apparatus to the Cell Membrane is guided by the fixed structure of the CYTOSKELETON. Cytoskeleton consists of: (L3 , slide 24) o Actin filaments o Intermediate filaments o Microtubules Remember that there are myosin molecules use ATP to move the actin filaments.

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