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Examples of Endocytosis

[Summary]Endocytosis All Eukaryotic Cells Constantly Ingest Fluid and Molecules by Pinocytosis In contrast to phagocytosis, pinocytosis begins with small, convex pits on the cell surface that collect material or fluid to be internalized. The convex pits expan

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Endocytosis

All Eukaryotic Cells Constantly Ingest Fluid and Molecules by Pinocytosis

In contrast to phagocytosis, pinocytosis begins with small, convex pits on the cell surface that collect material or fluid to be internalized. The convex pits expand into the interior of the cell forming small vesicles that pinch from the inside of the plasma membrane. All eukaryotic cells have a continuous stream of vesicles budding from the plasma membrane. The constant removal of membrane from the plasma membrane would quickly deplete the plasma membrane if not for the balancing effects of another continual process called exocytosis. Exocytosis is the process by which vesicles from inside the cell fuse with the plasma membrane to secrete material and fluid. So, pinocytosis brings fluid and material into the cell and removes membrane from the plasma membrane, while exocytosis expels fluid and mate-rial from the cell while adding membrane to the plasma membrane. Thus, the two processes work together to continuously recycle the plasma membrane.

Endocytosis

Endocytosis

Endocytosis is a type of active transport that moves particles, such as large molecules, parts of cells, and even whole cells, into a cell. There are different variations of endocytosis, but all share a common characteristic: the plasma membrane of the cell invaginates, forming a pocket around the target particle. The pocket pinches off, resulting in the particle being contained in a newly-created intracellular vesicle formed from the plasma membrane.

Endocytosis

Phagocytosis

Pinocytosis

Receptor-Mediated Endocytosis

Games Parasites Play

Endocytosis

In 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, coated with molecules of the protein clathrin, and pinched off forming a membrane-bounded vesicle called an endosome.

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Endocytosis

The different types of endocytosis

Endocytosis is a form of active transport in which a cell transports molecules (such as proteins) into the cell (endo- + cytosis) by engulfing them in an energy-using process. Endocytosis and its counterpart, exocytosis, are used by all cells because most chemical substances important to them are large polar molecules that cannot pass through the hydrophobic plasma or cell membrane by passive means.

Receptor-Mediated Endocytosis

Below are some examples of ligands that are taken up by endocytosis and the receptors to which they bind.

Iron Uptake

Cholesterol Uptake

Epidermal Growth Factor Receptor

What are Endocytosis and Exocytosis? | Wyzant Resources

The movement of macromolecules such as proteins or polysaccharides into or out of the cell is called bulk transport. There are two types of bulk transport, exocytosis and endocytosis, and both require the expenditure of energy (ATP).

In exocytosis, materials are exported out of the cell via secretory vesicles. In this process, the Golgi complex packages macromolecules into transport vesicles that travel to and fuse with the plasma membrane. This fusion causes the vesicle to spill its contents out of the cell. Exocytosis is important in expulsion of waste materials out of the cell and in the secretion of cellular products such as digestive enzymes or hormones.

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