Final answer:
Exocytosis is a bulk transport process where molecules exit a cell via vesicles that fuse with the plasma membrane, allowing the release of contents outside of the cell. It is a form of active transport, essential for secretion and waste disposal in cells.
Step-by-step explanation:
The type of bulk transport where molecules move out of a cell via secretory vesicles is called exocytosis. During exocytosis, a vesicle containing substances to be expelled moves through the cytoplasm to the cell membrane. There, the vesicle membrane fuses with the cell membrane, and its contents are released outside of the cell. This process is essential for various cellular functions, such as the secretion of hormones, neurotransmitters, and digestive enzymes.
Vesicle transport is a type of active transport that requires energy because it moves substances against their concentration gradient or involves large molecules that cannot easily pass through the plasma membrane. Exocytosis is a critical mechanism that allows cells to communicate with their environment and maintain homeostasis by disposing of waste products and releasing necessary materials.