Glucagon-Like Peptide-1 (GLP-1) Is a Hormone Peptide Secreted by Intestinal $\beta$

Glucagon-like peptide-1 (GLP-1) is a hormone peptide secreted by intestinal L cells. It is secreted in response to the nutrient detection in the small intestine. The resulting physiological response is the lowering of blood glucose levels. Which of the following is a potential mechanism for how GLP-1 causes this physiological response?

A) stimulation of glucagon release
B) stimulation of insulin release by pancreatic $\beta$ cells
C) increase in the apoptosis rate of pancreatic $\beta$ cells
D) downregulation of GLUT4

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