What is the storage form of carbohydrates in humans?

Glycogen is the correct answer as it is the primary storage form of carbohydrates in humans. When carbohydrates are consumed, they are broken down into glucose, which can be used immediately for energy. However, excess glucose is not simply left in the bloodstream; instead, it is converted into glycogen through a process called glycogenesis. Glycogen is predominantly stored in the liver and muscles, where it can be quickly mobilized to meet energy demands when needed, such as during physical activity or fasting.

Understanding this concept is crucial as it highlights how the body regulates blood sugar levels and maintains energy balance. The other options, like glucose, refer to the immediate energy source rather than storage, while starch is a storage form of carbohydrates found in plants, not humans. Insulin, on the other hand, is a hormone that plays a key role in regulating glucose levels but is not a storage form of carbohydrates itself. This discernment of roles helps clarify the metabolic pathways associated with energy utilization and storage in the human body.