Secretion of insulin from beta cells of the pancreas is an example of which membrane function?
Correct answer: C. Exocytosis
- A. Endocytosis
- B. Phagocytosis
- C. Exocytosis
- D. Pinocytosis
Explanation
The correct answer is exocytosis. In exocytosis, cells release substances by fusing vesicles containing the substances with the plasma membrane, allowing the contents to be expelled outside the cell. For insulin secretion, insulin is stored in vesicles in beta cells and released when the vesicles fuse with the plasma membrane, typically in response to increased blood glucose levels. Endocytosis, phagocytosis, and pinocytosis involve the uptake of substances into the cell, which is opposite to the secretion process.
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