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Ch. 6 Respiratory System, Diseases Caused by Tobacco Smoke, Breathing…
Ch. 6 Respiratory System
Aerobic Respiration
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Requires oxygen as oxygen obtained during breathing is used duringaerobic respiration to break down glucose to release energy
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Oxygen debt
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1) When vigorous activities continue, muscular contractions are so vigorous that maximum aerobic respiration is unable to release energy fast enough to reach the demand
2) The energy demand increases as vigorous activity increases. As a result the muscles carry out anaerobic respiration, producing lactic acid
3) When we perform physical activities, our breathing rate and heart rate increases. This allows more energy to be released through aerobic respiration to meet the increased energy demand
Respiratory System
Trachea: Warms and moistens the air entering the lungs, mucus secreted by gland cells trap bacteria and dust particles, and contains cilia which sweeps the mucus up the throat.
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Gland cells: Secretes mucus to trap dust particles and bacteria in air that is channeled to the lungs
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