endocytosis
Quick Summary
Endocytosis is a biological process where a cell engulfs external substances, enclosing them in a membrane-bound vesicle called an endosome that is drawn into the cell. This process allows cells to absorb essential nutrients and remove waste products, acting as a gate for transport across the cell membrane.1
There are several types of endocytosis:
* Pinocytosis: The cell membrane engulfs small vesicles containing fluid.21
* Phagocytosis: The cell membrane engulfs larger vesicles containing solid matter.1
* Receptor-mediated endocytosis: This occurs when material binds to specific receptors on the cell membrane, triggering the engulfment process.1
Cholesterol, for example, enters cells via receptor-mediated endocytosis.1
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cellEndocytosisIn this process the cell membrane engulfs portions of the external medium, forms an almost complete sphere around it, and then draws the membrane-bounded vesicle, called an endosome, into the cell. Several types of endocytosis have been distinguished: in pinocytosis, the vesicles are smallā¦
Read MoreIn this process the cell membrane engulfs portions of the external medium, forms an almost complete sphere around it, and then draws the membrane-bounded vesicle, called an endosome, into the cell. Several types of endocytosis have been distinguished: in pinocytosis, the vesicles are smallā¦
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cell membraneTransport of substancesā¦the cell is internalized (endocytosis) or part of the cellās internal medium is externalized (exocytosis). These movements involve a fusion between membrane surfaces, followed by the re-formation of intact membranes.
Read Moreā¦the cell is internalized (endocytosis) or part of the cellās internal medium is externalized (exocytosis). These movements involve a fusion between membrane surfaces, followed by the re-formation of intact membranes.
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horizontal gene transferSuspected mechanisms include conjugation and endocytosis, such as when a eukaryotic cell engulfs a prokaryotic cell and gathers it into a special membrane-bound vesicle for degradation. It is thought that in rare instances in endocytosis, genes escape from prokaryotes during degradation and are subsequently incorporated into the eukaryoteās genome.
Read MoreSuspected mechanisms include conjugation and endocytosis, such as when a eukaryotic cell engulfs a prokaryotic cell and gathers it into a special membrane-bound vesicle for degradation. It is thought that in rare instances in endocytosis, genes escape from prokaryotes during degradation and are subsequently incorporated into the eukaryoteās genome.
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human digestive systemGeneral features of digestion and absorptionEndocytosis takes place when the material to be absorbed, on reaching the cell membrane, is engulfed into the cell interior.
Read MoreEndocytosis takes place when the material to be absorbed, on reaching the cell membrane, is engulfed into the cell interior.
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lysosomeIn endocytosis, extracellular macromolecules are taken up into the cell to form membrane-bound vesicles called endosomes that fuse with lysosomes. Autophagocytosis is the process by which old organelles and malfunctioning cellular parts are removed from a cell; they are enveloped by internal membranes that then fuseā¦
Read MoreIn endocytosis, extracellular macromolecules are taken up into the cell to form membrane-bound vesicles called endosomes that fuse with lysosomes. Autophagocytosis is the process by which old organelles and malfunctioning cellular parts are removed from a cell; they are enveloped by internal membranes that then fuseā¦
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nervous systemNeurotransmitter releaseā¦from the plasma membrane through endocytosis. In this process the membranes are surrounded by a protein coat at the lateral margins of the synapse and are then transferred to cisternae, which form in the terminal during nerve stimulation. There the vesicles lose their coats, are probably refilled with neurotransmitter, andā¦
Read Moreā¦from the plasma membrane through endocytosis. In this process the membranes are surrounded by a protein coat at the lateral margins of the synapse and are then transferred to cisternae, which form in the terminal during nerve stimulation. There the vesicles lose their coats, are probably refilled with neurotransmitter, andā¦
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