Exocytosis is the process by which ...

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Study for the Pharmaceutics Xenobiotics Across Bio Membrane Test. Prepare with flashcards and multiple-choice questions, each providing hints and explanations. Get ready for your pharmacy exam!

Multiple Choice

Exocytosis is the process by which ...

Explanation:
Exocytosis is the release of substances from a cell by vesicle fusion with the plasma membrane. In this process, secretory vesicles inside the cell move to the membrane, fuse with it, and spit their contents out into the extracellular space. This is how neurotransmitters, hormones, and enzymes are secreted. The other options describe different transport ideas. Movement into the cell by vesicle formation is endocytosis, where material is brought inside. Ions crossing via pores refers to channel- or carrier-mediated transport, not vesicle fusion. Phagocytosis of large particles is a form of endocytosis that engulfs material rather than expelling it.

Exocytosis is the release of substances from a cell by vesicle fusion with the plasma membrane. In this process, secretory vesicles inside the cell move to the membrane, fuse with it, and spit their contents out into the extracellular space. This is how neurotransmitters, hormones, and enzymes are secreted.

The other options describe different transport ideas. Movement into the cell by vesicle formation is endocytosis, where material is brought inside. Ions crossing via pores refers to channel- or carrier-mediated transport, not vesicle fusion. Phagocytosis of large particles is a form of endocytosis that engulfs material rather than expelling it.

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