11 2014-12-09 Endocytosis and Exocytosis

8/18/2019 11 2014-12-09 Endocytosis and Exocytosis

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ENDOCYTOSIS ANDEXOCYTOSISDewajani PurnomosariDepartment of Histology and Cell BiologyFaculty of Medicine Universitas Gadjah [email protected]


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https://reader009.{domain}/reader009/html5/0727/5b5a753bb3668/5b5a753dca20d.jpg


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Endocytosis

• the cell engulfs some of its extracellular fluid ( ECF )including material dissolved or suspended in it.

• A portion of the plasma membrane is invaginated andpinched off forming a membrane-bounded vesicle called an endosome .


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Three types of Endocytosis


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Phagocytosis• cell eating• in the ingestion of particulate matter (e.g.,

bacteria) from the ECF.• The endosome is so large that it is called a

phagosome or vacuole .• Phagocytosis occurs only in certain specialized

cells (e.g., neutrophils, macrophages, theamoeba), and occurs sporadically.


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Figure 13-36 Molecular Biology of the Cell (© Garland Science 2008)


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Pinocytosis• cell drinking, the drop engulfed is relatively small• occurs in almost all cells• occurs continuously


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Figure 13-53 Molecular Biology of the Cell (© Garland Science 2008)

Receptor mediated Endocytosis


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EXOCYTOSIS


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http://cellbiology.med.unsw.edu.au/units/images/exocytosis_types.png


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11 2014-12-09 Endocytosis and Exocytosis

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