When a client's blood sugar drops too low, the pancreas refrains from releasing insulin. The nurse ...

Correct Answer: 2
Rationale 1: This is not a positive feedback mechanism.
Rationale 2: Insulin lowers circulating blood sugar by allowing glucose to enter cells. When the blood sugar is already too low, the pancreas notes the low level and refrains from releasing additional insulin into the bloodstream. This chain of events is known as negative feedback.
Rationale 3: This is not an example of up-regulation.
Rationale 4: This is not an example of down-regulation.
Global Rationale: Insulin lowers circulating blood sugar by allowing glucose to enter cells. When the blood sugar is already too low, the pancreas notes the low level and refrains from releasing additional insulin into the bloodstream. This chain of events is known as negative feedback. It is not a case of up-regulation or down-regulation.