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Chapter 4: Problem 19

Excess glucose in cells may be linked and be stored as _______ . (pp. 131-132)

Short Answer

Expert verified
Excess glucose in cells may be linked and be stored as glycogen.

Step by step solution

01

Identify Excess Glucose Storage

When glucose levels exceed the immediate energy needs of the cells, the body must convert and store the excess.
02

Understand the Conversion Process

Excess glucose in the cells is converted through a process called glycogenesis, where glucose molecules are bonded together.
03

Determine the Storage Form

The bonded glucose molecules form a polysaccharide called glycogen, which is stored in the liver and muscle tissues.
04

Finalize the Answer

Recognizing that glycogen is the storage form of excess glucose, we can complete the sentence accurately.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Glucose
Glucose is a simple sugar that's central to many biological processes. It's a monosaccharide, meaning it's composed of a single sugar unit. A primary source of energy, glucose is crucial for cellular functions. Cells break down glucose to release energy, which is then used to power various cellular activities.

Normally, glucose comes from dietary carbohydrates, which are broken down during digestion. Once in the bloodstream, glucose is transported to cells. The insulin hormone helps cells absorb glucose, ensuring they have a steady supply of energy.
  • Simple sugar (monosaccharide)
  • Main energy source for cells
  • Bloodstream carrier with help from insulin
Glycogenesis
Glycogenesis is the metabolic process where excess glucose is converted into glycogen for storage. The process is triggered when there's more glucose in the blood than the body needs for immediate energy.

During glycogenesis, glucose molecules are linked together in long chains, forming glycogen. This process primarily occurs in the liver and muscle tissues. Enzymes play critical roles in facilitating and regulating glycogenesis.
  • Conversion of glucose to glycogen
  • Occurs in liver and muscles
  • Triggered by excess glucose
  • Enzyme-mediated process
Polysaccharides
Polysaccharides are complex carbohydrates composed of long chains of monosaccharide units. In the context of glycogenesis, these chains are formed by multiple glucose molecules.

Glycogen is a type of polysaccharide. It's highly branched, which allows for rapid release of glucose when energy is needed. This structure makes polysaccharides efficient for both energy storage and quick mobilization.
  • Made of long monosaccharide chains
  • Include glycogen
  • Highly branched structure in glycogen
  • Efficient for energy storage and release
Energy Storage
Efficient energy storage is vital for maintaining energy balance in the body. Glycogen serves as a quick-access reservoir of glucose.

When the body requires energy, such as during exercise, glycogen is broken down back into glucose. This process provides a rapid source of energy. The liver and muscle tissues store the majority of glycogen in the human body, prepared for times of need.
  • Glycogen as an energy reserve
  • Quick glucose source during high energy demand
  • Stored in liver and muscles
  • Ensures energy balance

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