Which of the following events does not occur when concentration of glucose in the liver decreases:
**Core Concept**
The liver plays a crucial role in glucose metabolism by storing glycogen, releasing glucose into the bloodstream, and regulating gluconeogenesis. When the concentration of glucose in the liver decreases, the body responds by activating various mechanisms to restore normal glucose levels.
**Why the Correct Answer is Right**
When the concentration of glucose in the liver decreases, the liver releases glucagon, a hormone produced by the pancreas. Glucagon stimulates the breakdown of glycogen to glucose, a process known as glycogenolysis. This increases the concentration of glucose in the liver, which is then released into the bloodstream. Another mechanism is the activation of gluconeogenesis, a process by which the liver generates new glucose molecules from non-carbohydrate sources such as amino acids and lactate.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is not relevant to the scenario described in the question. The liver's response to decreased glucose concentration is not to increase insulin secretion, but rather to release glucagon and activate gluconeogenesis.
**Option B:** This option is incorrect because the liver does not release insulin in response to decreased glucose concentration. Insulin is released in response to increased glucose concentration, not decreased.
**Option C:** This option is incorrect because the liver does not produce lipase in response to decreased glucose concentration. Lipase is an enzyme involved in the breakdown of fats, not glucose.
**Option D:** This option is incorrect because the liver does not increase its uptake of glucose from the bloodstream in response to decreased glucose concentration. In fact, the liver decreases its uptake of glucose in response to decreased glucose concentration.
**Clinical Pearl / High-Yield Fact**
When the concentration of glucose in the liver decreases, the liver's primary response is to release glucagon and activate gluconeogenesis to restore normal glucose levels. This is a critical mechanism for maintaining blood glucose homeostasis.
**Correct Answer: C. Lipase**