Although most solutes that enter or exit the cell are relatively small (inorganic ions, sugars, or amino acids), occasionally the movement of larger molecules into or out of the cell is required. For example, certain cells secrete proteins, such as pancreatic cells that secrete insulin. Other cells take up food particles or even entire cells, such as lymphocytes in your immune system. Transport of such large materials into and out of the cytosol cannot be accomplished by transport proteins in the plasma membrane. The transport of large molecules is accomplished by bulk transport via exocytosis and endocytosis. Like other forms of active transport, bulk transport requires an input of energy. Before beginning this tutorial, watch the segment of the Membrane Transport animation on exocytosis and endocytosis. Observe the role that vesicles play in transport of materials into and out of the cell. Part A - Exocytosis and endocytosisSort the phrases into the appropriate bins depending on whether they describe exocytosis, endocytosis, or both. ResetHelpincreases the surface area of the plasma membranetransported substances never physically cross the plasma membranesecretes large molecules out of the celldecreases the surface area of the plasma membranerequires cellular energyrequires fusion of vesicles with the plasma membrane Selectedexocytosisforms vesicles from inward folding of the plasma fusion of vesicles with the plas
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Although most solutes that enter or exit the cell are relatively small (inorganic ions, sugars, or a...
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