Respiration and exercise

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  • Aerobic Respiration
    • Glucose + O2 > CO2 + H2O (+ ENERGY)
    • Most reactions of respiration take place in the mitochondria and are controlled by enzymes.
    • The energy produced may be used by the organism to: 1.Build larger molecules from smaller ones. 2.Enable muscle contraction. 3. Maintain a constant body temp 4. Build sugars, nitrates, and other nutrients into amino acids and then proteins in plants.
    • The limewater test is used to detect CO2. When CO2 is present, limewater goes cloudy.
  • Anaerobic respiration
    • When muscles are used over a long period of time they will become fatigues and stop contracting efficently
    • The glucose is not completely broken down in anaerobic respiration and lactic acid os produced.
    • Glucose > Lactic acid + Energy
    • When your muscles cannot get enough oxygen for aerobic respiration, they start to respire anaerobically.
  • Effects of exercise on the body
    • You need to increase the rate at which o2 and glucose reach the muscle cells for aerobic respiration.
    • You also need to remove the extra waste co2 produced quicker.
    • when you exercise your muscles need more energy so that they can contract.
    • The heart rate increased and the blood vessels supplying the muscles dilate, this allows more bloody containing o2 and glucose to reach the muscles.
    • Muscles store glucose as glycogen. The glycogen can be converted back to glucose for use during exercise.
    • Your breathing rate and the depth of each breath also increases, this allows a greater uptake of o2 and release of co2 at the lungs.


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