Answer:
The missing statements are:
a. Positive feedback caused his pancreas to stop secreting insulin.
b. Negative feedback caused his pancreas to stop secreting insulin.
c. Negative feedback caused his pancreas to produce more insulin.
d. Positive feedback caused his pancreas to produce more insulin.
The answer is b. Negative feedback caused his pancreas to stop secreting insulin.
Step-by-step explanation:
When we ingest carbohydrates, glucose levels in the blood increase, the body detects this rise and signals the pancreas to produce insulin. Insulin is released into the bloodstream and causes glucose to enter the cells and the liver, decreasing glucose concentrations in the blood. As a result of this decrease, the pancreas stops producing insulin. We call this process negative feedback since the reduction of glucose is the signal that ceases insulin production.