Living organism like us obtain energy from food as inside our body after the process of digestion it is burnt inside our body &mixed with oxygen then it is supplied to all parts of the body

Energy Acquisition in Living Organisms
Living organisms obtain energy from food through a series of biochemical processes that convert nutrients into usable energy. This is essential for maintaining life, supporting growth, and enabling various biological functions.
1. Types of Nutrients
- Carbohydrates: Primarily serve as a quick energy source. They are broken down into glucose, which is a key energy substrate.
- Proteins: While primarily used for growth and repair, proteins can also be converted into energy when carbohydrates are scarce.
- Fats: Provide a dense source of energy and are metabolized for long-term energy storage.
2. Metabolic Processes
- Digestion: Food is broken down into smaller molecules in the digestive system. Enzymes play a crucial role in this process, transforming complex food into simpler forms.
- Cellular Respiration: This is the primary way cells generate energy. It occurs in three main stages:
- Glycolysis: Breaks down glucose into pyruvate, producing a small amount of ATP (energy currency).
- Krebs Cycle: Pyruvate enters the mitochondria, where it is further broken down, releasing carbon dioxide and transferring energy to electron carriers.
- Electron Transport Chain: Uses electrons from carriers to produce a large amount of ATP, utilizing oxygen in aerobic conditions.
3. Energy Storage and Utilization
- ATP (Adenosine Triphosphate): The primary energy carrier in cells. It stores energy in its high-energy phosphate bonds.
- Energy Release: When energy is needed, ATP is converted to ADP (Adenosine Diphosphate) and inorganic phosphate, releasing energy for cellular processes.
Through these processes, living organisms efficiently convert food into energy, enabling them to thrive and perform essential life functions.