Insulin
A)is secreted by the beta cells of the islets of Langerhans.
B)is secreted by the liver.
C)raises blood glucose levels.
D)is released by the pancreas in response to low blood glucose levels.

Question

Quizplus · Accepted Answer

Insulin is secreted by the beta cells of the islets of Langerhans in the pancreas.

Answer: D 
 Insulin is released by the pancreas in response to low blood glucose levels, in order to help the body take up glucose from the blood and use it for energy. Option B is incorrect because insulin is not secreted by the liver, and option C is also incorrect because insulin actually lowers blood glucose levels.