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pinocytosis

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pinocytosis /pino·cy·to·sis/ (pi″nah-si-to´sis) a mechanism by which cells ingest extracellular fluid and its contents; it involves the formation of invaginations by the cell membrane, which close and break off to form fluid-filled vacuoles in the cytoplasm.pinocytot´ic
Enlarge picture
Pinocytosis of small fluid droplets.

pin·o·cy·to·sis (pn-s-tss, -s-, pn-)
n.
Introduction of fluids into a cell by invagination of the cell membrane, followed by formation of vesicles within the cells.

pino·cy·totic (-ttk) adj.

pinocytosis
[pī′nōsītō′sis]
Etymology: Gk, pinein + kytos + osis, condition
the process by which extracellular fluid is taken into a cell. The plasma membrane develops a saccular indentation filled with extracellular fluid and then pinches off the indentation, forming a vesicle or vacuole of fluid within the cell.

pinocytosis [pin″o-si-to´sis]
a mechanism by which cells ingest extracellular fluid and its contents; it involves the formation of invaginations by the cell membrane, which close and break off to form fluid-filled vacuoles in the cytoplasm (see accompanying illustration). adj., adj pinocytot´ic.
Mechanism of pinocytosis. Tiny droplets of fluid are trapped by the folds of the plasma membrane and engulfed as fluid-filled vesicles into the cytoplasm.

pinocytosis (pī´nōsītō´sis),
pinocytosis
a mechanism by which cells ingest extracellular fluid and its contents; it involves the formation of invaginations by the cell membrane, which close and break off to form fluid-filled vacuoles in the cytoplasm.
Enlarge picture
Mechanism of pinocytosis. By permission from Guyton R, Hall JE, Textbook of Medical Physiology, Saunders, 2000

pin·o·cy·to·sis (pin'ō-sī-tō'sis, pī'nō-),
The cellular process of actively engulfing liquid, a phenomenon in which minute incuppings or invaginations are formed in the surface of the cell membrane and close to form fluid-filled vesicles; it resembles phagocytosis.
[pinocyte + G. -osis, condition]

pin·o·cy·to·sis (pin'ō-sī-tō'sis)
The cellular process of actively engulfing liquid, a phenomenon in which minute incuppings or invaginations are formed in the surface of the cell membrane and close to form fluid-filled vesicles; it resembles phagocytosis.
[pinocyte + G. -osis, condition]

pin·o·cy·to·sis (pin'ō-sī-tō'sis)
The cellular process of actively engulfing liquid, a phenomenon in which minute incuppings or invaginations are formed in the surface of the cell membrane and close to form fluid-filled vesicles.
[pinocyte + G. -osis, condition]


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At a cellular level, the virus enters the cell through pinocytosis and the viral RNA fuses with the host vacuole membrane thereby capping the viral RNA and is transported to the nucleus where replication starts.
Nonselective pinocytosis has been suggested as the transport mechanism for IgG transport across intestinal epithelium (Besser and Gay, 1985).
Phagocytosis and pinocytosis are distinguished by the size of endocytic vesicles formed.
 
 
 
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