31 Human Breathing.notebook R. Cummins 1 April 21, 2013 Chapter 31 Human Breathing
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31 Human Breathing.notebook
R. Cummins 1
April 21, 2013
Chapter 31 Human Breathing
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Chapter 31 Human BreathingFunctions of the system,Take in Oxygen.Release Carbon Dioxide.Release Water Vapour.
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Lungs
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Each bronchus subdivides into about 1 million bronchioles.These end in tiny, hollow, balloonlike air sacs called alveoli.
Alveoli
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The inhaled Oxygen diffusesinto the blood and then intocells where it is used forrespiration. CO2 and H2Oare then diffused back into
the blood stream.
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Breathing Disorder AsthmaSymptomsSigns of asthma include noisy, wheezy breathing and breathlessness
Causes ExternalAttacks may be triggered by Allergens, which can be pollen, dust, animal hair, etc.
Causes InternalDuring an attack the bronchioles become narrow.10% of children have asthma and it is increasing in developed countries.
PreventionAvoid the allergens that cause the reaction and use an inhaler.
TreatmentBronchodilators are inhalers that widen the bronchioles. Steroids or injections may also be given for more serious conditions.
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Control of Human Breathing Higher Level
Human breathing is controlled by the Medulla Oblongata.
Carbon Dioxide builds up in the blood from Respiration.
Carbon dioxide is acidic and causes the blood pH to drop.
This drop is sensed by the brain and causes the lungs to inhale.
So, our Oxygen intake is controlled by CO2 levels (as in plants).
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Exercise and Breathing
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