Embedded Files
objectives
objectives
- Outline the role of respiration in providing energy for the activities of cells
- State the equation for aerobic respiration using symbols: C6H12O6 + 6O2 → 6CO2 + 6H2O
Definition: Respiration
Definition: Respiration
Respiration: the chemical reactions that break down nutrient molecules in living cells to release energy
There are two types of respiration Aerobic and Anaerobic.
Why do Organisms need Energy?
Why do Organisms need Energy?
All organisms require energy to maintain all Life Processes
The following processes require energy:
- Active transport
- Muscle contraction
- Cell division
- Protein synthesis
- Nerve impulses
- Maintaining body temperature
Respiration in Eukaryotic Cells - Location and Organelles
Respiration in Eukaryotic Cells - Location and Organelles
Respiration is the release of energy from food. It occurs in every living cell. In eukaryotic cells the main reactions occur in the mitochondria.
Respiration Produces ATP
Respiration Produces ATP
Respiration releases the energy stored in glucose and stores it in a molecule called ATP.
The energy stored in ATP can then be used by the cell to carry out all its activities, e.g. active transport, cell division, protein synthesis.
ATP is the primary energy carrier in all living organisms on earth!
Aerobic Respiration
Aerobic Respiration
Aerobic Respiration is the process which Releases energy (producing ATP) from glucose by reacting it with oxygen!
Key Equations - Aerobic Respiration
Key Equations - Aerobic Respiration
Glucose + oxygen --> carbon dioxide + water (+ energy)
C6H12O6 + O2 --> CO2 + H2O (+ ATP)
Anaerobic Respiration
Anaerobic Respiration
Anaerobic Respiration is the process which Releases energy (producing ATP) from glucose without oxygen!
Examples of anaerobic respiration:
- Yeast causing bread to rise
- Yeast producing ethanol in beer production
- Animals carrying out short bursts of exercise
- Plant roots in waterlogged soils
Key Equation - Anaerobic Respiration in Muscle Cells
Key Equation - Anaerobic Respiration in Muscle Cells
Glucose --> lactic acid (+ some energy)
Why is Anaerobic Respiration not used all the time?
Why is Anaerobic Respiration not used all the time?
- Less ATP is produced for every molecule of glucose
- Lactic acid can result in fatigue and cramp
- After anaerobic respiration has taken place, lactic acid need to be broken down (into carbon dioxide and water) and this requires additional oxygen – the oxygen debt
Key Equation - Anaerobic Respiration in Plants and Yeast
Key Equation - Anaerobic Respiration in Plants and Yeast
Glucose --> carbon dioxide + ethanol (+ some energy)
table activity
table activity
Complete the table in your workbooks
Past Paper Question
Past Paper Question
Complete the past paper exam question below:
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