The release of the protein insulin from pancreatic cells occurs by
A)endocytosis.
B)pinocytosis.
C)phagocytosis.
D)exocytosis.
E)receptor-mediated endocytosis.

Question

Quizplus · Accepted Answer

Insulin is a protein hormone produced by the beta cells of the pancreas. When insulin is needed, it is released into the bloodstream by exocytosis, which is the process of fusing insulin-containing vesicles with the plasma membrane and releasing their contents outside the cell. This allows insulin to be transported to its target tissues, where it can bind to its receptor and signal for glucose uptake. The other options (A, B, C, E) are all types of endocytosis, which is the process of internalizing substances into the cell. This is the opposite of exocytosis and is not involved in insulin release.

The Release of the Protein Insulin from Pancreatic Cells Occurs