Carbohydrate metabolism

Carbohydrate Metabolism

Diagram of carbohydrate metabolism pathways

Carbohydrate metabolism refers to the various biochemical processes responsible for the formation, breakdown, and interconversion of carbohydrates in living organisms. Carbohydrates are central to many metabolic pathways and are crucial for energy production in cells.

Overview

Carbohydrates are one of the primary sources of energy for the body. They are broken down into simple sugars, primarily glucose, which is then used in various metabolic pathways to produce ATP, the energy currency of the cell.

Glycolysis

Glycolysis is the process of breaking down glucose into pyruvate, yielding ATP and NADH. It occurs in the cytoplasm of cells and does not require oxygen, making it an anaerobic process.

Citric Acid Cycle

The citric acid cycle, also known as the Krebs cycle, takes place in the mitochondria and is a key component of aerobic respiration. It processes acetyl-CoA, derived from pyruvate, to produce ATP, NADH, and FADH2.

Gluconeogenesis

Gluconeogenesis is the synthesis of glucose from non-carbohydrate precursors, such as amino acids and glycerol. This process is crucial during fasting or intense exercise when glucose levels are low.

Glycogen Metabolism

Glycogen is a stored form of glucose in the liver and muscles. Glycogen metabolism involves two main processes: glycogenesis, the formation of glycogen from glucose, and glycogenolysis, the breakdown of glycogen back into glucose.

Pentose Phosphate Pathway

The pentose phosphate pathway is an alternative pathway for glucose oxidation. It generates NADPH and ribose-5-phosphate, which are essential for biosynthetic reactions and nucleotide synthesis, respectively.

Disorders of Carbohydrate Metabolism

Disorders in carbohydrate metabolism can lead to various diseases, such as diabetes mellitus, galactosemia, and glycogen storage disease. These conditions often result from enzyme deficiencies or hormonal imbalances affecting carbohydrate processing.

Related Pages

• Glycolysis
• Citric acid cycle
• Gluconeogenesis
• Glycogen
• Pentose phosphate pathway
• Diabetes mellitus