Which cellular process is responsible for a cell releasing large amounts of material to the extracellular space by fusion of vesicles with the plasma membrane?

• A. Facilitated diffusion through a membrane channel
• B. Exocytosis
• C. Endocytosis
• D. Osmosis

Answer: (B)

Verified step by step guidance

1. Identify the key concept in the question: the process involves a cell releasing large amounts of material to the extracellular space.
2. Recall that cellular transport processes involving vesicles include endocytosis (bringing materials into the cell) and exocytosis (releasing materials out of the cell).
3. Understand that exocytosis is the process where vesicles inside the cell fuse with the plasma membrane to release their contents outside the cell.
4. Recognize that facilitated diffusion and osmosis are passive transport mechanisms that do not involve vesicle fusion or large-scale material release.
5. Conclude that the correct cellular process described is exocytosis, as it specifically involves vesicle fusion with the plasma membrane to secrete substances.