Exocytosis

Exocytosis is essentially the reverse of endocytosis. In exocytosis, substances made within the cell are packaged into a vesicle, which then fuses with the cell membrane, thereby releasing its contents outside the cell. Cells secrete some proteins by this process. Nerve cells use exocytosis to release the neurotransmitter chemicals that signal other nerve cells, muscle cells, or glands (fig. 3.33). The Golgi apparatus plays a role in this process, as described earlier in this chapter (page 74).

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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