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Nutrient Absorption
Carbohydrates, fats, and proteins from food are broken down into smaller molecules and absorbed into the bloodstream for cellular use.
Understanding Energy Metabolism
How cells convert nutrients into the energy currency that powers all biological processes.
The Energy Conversion Process
Metabolism encompasses all chemical reactions that occur within cells to maintain life.
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Glycolysis
In the cytoplasm, glucose is split into two pyruvate molecules, generating a small amount of ATP and NADH in the process.
3
Krebs Cycle
Acetyl-CoA enters the citric acid cycle within mitochondria, producing electron carriers and releasing carbon dioxide.
4
Oxidative Phosphorylation
Electrons flow through the transport chain, creating a proton gradient that drives ATP synthase to produce substantial amounts of ATP.
Fueling Cellular Activity
Different nutrients serve as fuel sources for energy production.
Carbohydrates
Glucose is the primary and preferred fuel source for most cells. It provides quick energy and is essential for brain function.
Lipids
Fatty acids undergo beta-oxidation to produce acetyl-CoA. Fats provide more ATP per molecule but require more oxygen.
Proteins
Amino acids can be converted to metabolic intermediates when other fuel sources are limited, though this is not their primary function.
ATP: The Universal Energy Currency
Adenosine triphosphate (ATP) stores and transfers chemical energy within cells. When ATP releases a phosphate group, energy is released for cellular work.
This continuous cycle of ATP synthesis and breakdown powers everything from muscle movement to protein synthesis to nerve signal transmission.
- ATP is constantly recycled within cells
- Humans produce their body weight in ATP daily
- ATP cannot be stored in large quantities
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