Storage form of energy in liver is –
**Core Concept**
The liver stores energy in the form of glycogen, a complex carbohydrate that can be broken down into glucose and used by the body as needed. This process is crucial for maintaining blood glucose levels and providing energy to cells during times of fasting or increased demand.
**Why the Correct Answer is Right**
Glycogen is synthesized in the liver and muscles through a process called glycogenesis, which involves the enzyme glycogen synthase. Glycogen is stored in the liver and muscles as a readily available source of glucose. When glucose levels are low, glycogen is broken down into glucose through glycogenolysis, a process that requires the enzyme glycogen phosphorylase. This glucose is then released into the bloodstream to be used by cells throughout the body.
**Why Each Wrong Option is Incorrect**
* **Option A:** This option is incorrect because the liver does not primarily store energy in the form of fat. While the liver does store fat in the form of triglycerides, this is not its primary function.
* **Option B:** This option is incorrect because the liver does not store energy in the form of protein. While the liver does synthesize and break down protein, it is not a primary storage form of energy.
* **Option C:** This option is incorrect because the liver does not store energy in the form of ATP (adenosine triphosphate). While ATP is an energy-rich molecule, it is not stored in the liver as a long-term energy reserve.
**Clinical Pearl / High-Yield Fact**
The liver's glycogen stores can be depleted within 24 hours of fasting, highlighting the importance of adequate nutrition and glucose intake to maintain blood glucose levels.
**Correct Answer:** C. Glycogen.