Energy in the Body
- Created by: Grace.2006
- Created on: 28-09-23 14:08
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- Energy in the Body
- Energy is delivered to the body through the foods we eat and liquids we drink.
- Foods contain a lot of stored chemical energy
- When you eat your body breaks down these foods into smaller components and absorbs them to use as fuel.
- Energy comes from the three main nutrients.
- Carbohydrates.
- Most important energy source.
- Fats.
- Proteins.
- Carbohydrates.
- When carbohydrate supplies have been depleted the body can utilise fats and protein for energy
- Metabolism is the chemical reactions in the body's cells that change food into energy.
- Energy Transformations
- Chemical Energy.
- Most common.
- Is in the chemical bond that unites atoms or molecules with each other.
- Energy can neither be created nor destroyed
- It changes from one form to another
- Known as the law of conservation of energy.
- It changes from one form to another
- Chemical Energy.
- The Role of Energy:
- Needed to circulate blood, lymph, and tissue fluid throughout the body.
- Necessary for breathing and taking oxygen.
- Necessary for making new cells for carrying out growth and repair.
- Used to transmit nerve impulses so responses to changes can be done
- Needed to build different complex molecules from the simple molecules after digestion,
- Enzymes.
- Hormones.
- ATP
- Foods are metabolised at a cellular level to make ATP through cellular respiration,
- Adenosine Triphosphate
- Cells use ATP for energy for cellular processes.
- Muscle contraction
- Cell division.
- This process requires oxygen.
- Aerobic respiration.
- Catabolism
- The breaking down of molecules into smaller units, releasing energy.
- Biomolecules
- Carbohydrates
- Glucose
- Fats
- Fatty Acid
- Proteins
- Amino Acid
- Carbohydrates
- The oxidation of glucose inside of a cell is a catabolic reaction.
- Anabolism
- The building up of complex molecules using the energy released from catabolism
- Aerobic Respiration
- Glucose and Oxygen
- Produces carbon dioxide and water
- Lots of energy
- Products are easily released by the body
- Anaerobic Respiration
- Uses glucose only
- Produces lactic acid
- Small releases of energy
- Oxygen debt
- To break down the lactic acid
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