If a normal individual receives an insulin injection that lowers plasma glucose to 30 mg/dl, which of thefollowing hormones will not be released-
**Core Concept**
The normal physiological response to hypoglycemia involves the release of counter-regulatory hormones to increase glucose levels. This response is mediated by the hypothalamus and involves the release of hormones such as glucagon, cortisol, and adrenaline.
**Why the Correct Answer is Right**
When plasma glucose falls below a certain threshold, the hypothalamus detects this decrease and triggers the release of counter-regulatory hormones. Glucagon, cortisol, and adrenaline are all released in response to hypoglycemia, leading to an increase in glucose levels through various mechanisms. Glucagon stimulates glycogen breakdown and gluconeogenesis, cortisol promotes gluconeogenesis and glycogenolysis, and adrenaline stimulates glycogenolysis and gluconeogenesis. The hormone that is not released in response to hypoglycemia is insulin, as its presence would exacerbate the hypoglycemic state.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is not provided.
* **Option B:** This option is not provided.
* **Option C:** This option is not provided.
* **Option D:** This option is not provided.
**Clinical Pearl / High-Yield Fact**
In patients with diabetes, the release of counter-regulatory hormones in response to hypoglycemia can be impaired, leading to a reduced ability to increase glucose levels. This is why patients with diabetes often require treatment with glucagon or other counter-regulatory hormones in the event of hypoglycemia.
**Correct Answer:** A. Insulin is not released in response to hypoglycemia, as its presence would exacerbate the hypoglycemic state.