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Related Concept Videos

What is Metabolism?00:52

What is Metabolism?

Overview
Introduction to Metabolism01:30

Introduction to Metabolism

Metabolism encompasses all biochemical reactions in a living organism, facilitating both the breakdown and synthesis of biomolecules. These metabolic processes are categorized into catabolic and anabolic pathways, which operate in a coordinated manner to ensure energy balance and cellular function.Catabolic Pathways and Energy ReleaseCatabolic pathways involve the breakdown of complex macromolecules such as carbohydrates, lipids, and proteins into smaller structures like monosaccharides, fatty...
Overview of Metabolism01:40

Overview of Metabolism

Living cells constantly carry out various chemical reactions which are necessary for their proper functioning. These reactions are interlinked to one another via multiple pathways. The collection of these chemical reactions is known as metabolism.
Plant Metabolism
Sunlight, the primary source of energy in plants, is first absorbed by the chlorophyll pigments present in their leaves. Plants then use this energy to carry out photosynthesis, where water is oxidized into oxygen and carbon dioxide...
Metabolic Rate01:25

Metabolic Rate

The human body is a powerhouse of energy, with every cell performing numerous functions that require energy. This energy production and consumption is measured by the metabolic rate, which quantifies the total heat generated by all the body's chemical reactions and mechanical work. This measurement helps to determine the rate of kilocalorie (kcal) consumption needed to fuel all ongoing activities.
The Basal Metabolic Rate (BMR) measures the energy expended at rest.
Several factors influence the...
Types of Chemical Reactions: Anabolic and Catabolic01:19

Types of Chemical Reactions: Anabolic and Catabolic

The first law of thermodynamics holds that energy can neither be created nor destroyed—it can only change form. An organism's essential function is to consume (ingest) energy and molecules in the foods we eat, convert some of it into fuel for movement, sustain our body functions, and build and maintain our body structures. There are two types of reactions that accomplish this: anabolism and catabolism.
Anabolism is the process of combining smaller, simpler molecules into larger, more complex...
Regulation of Metabolism01:19

Regulation of Metabolism

Cellular needs and conditions vary from cell to cell and change within individual cells over time. For example, the required enzymes and energetic demands of stomach cells are different from those of fat storage cells, skin cells, blood cells, and nerve cells. Furthermore, a digestive cell works much harder to process and break down nutrients during the time that closely follows a meal compared with many hours after a meal. As these cellular demands and conditions vary, so do the amounts and...

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Related Experiment Video

Updated: May 11, 2026

Calorespirometry: A Powerful, Noninvasive Approach to Investigate Cellular Energy Metabolism
09:08

Calorespirometry: A Powerful, Noninvasive Approach to Investigate Cellular Energy Metabolism

Published on: May 31, 2018

Energy and metabolism.

Raul K Suarez1

  • 1Department of Ecology, Evolution and Marine Biology, University of California, Santa Barbara, California, USA. suarez@lifesci.ucsb.edu

Comprehensive Physiology
|May 31, 2013
PubMed
Summary
This summary is machine-generated.

Energy metabolism studies integrate multiple disciplines, viewing metabolic rates as system properties. Evolution drives significant deviations from scaling rules, especially in diverse environments like the deep sea.

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Area of Science:

  • Integrative biology
  • Metabolic biochemistry
  • Systems biology

Background:

  • Energy metabolism research has expanded beyond biochemistry to encompass ecological and evolutionary perspectives.
  • Cellular bioenergetics involves ATP hydrolysis and resynthesis, with pathway fluxes and metabolic rates recognized as system properties.
  • Understanding energy metabolism increasingly relies on systems biology approaches.

Purpose of the Study:

  • To explore the integrative, comparative, ecological, and evolutionary scope of energy metabolism studies.
  • To outline a mechanistic foundation for understanding patterns in metabolic rates.
  • To emphasize the impact of evolution on metabolic scaling rules.

Main Methods:

  • Systems biology approaches to analyze metabolic rates across cellular, tissue, organ, and organismal levels.
  • Investigating the influence of body mass and temperature on metabolic rate variation.
  • Examining evolutionary adaptations and their effect on metabolic scaling.

Main Results:

  • Metabolic rates are increasingly understood as system properties across multiple organizational levels.
  • Body mass and temperature explain a significant portion of metabolic rate variation.
  • Evolutionary adaptations lead to substantial deviations from established metabolic scaling rules, particularly in extreme environments.

Conclusions:

  • Energy metabolism is a complex field requiring an integrative, systems-level approach.
  • Evolutionary processes significantly shape metabolic rates and challenge simple scaling laws.
  • Further research is needed to integrate phenomena across multiple levels of biological organization, especially in understudied environments.