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The function of the respiratory system is to take in oxygen and to exhale gases such as carbon dioxide.

If the respiratory system isn't working well - such as in Asthma, bronchitis, emphysema, sarcoidosis - the amount of oxygen in the blood will fall and the poisonous gases will not be exhaled properly. All body systems need oxygen to function properly so when there is too little oxygen, the body shuts down 'non-essential' tasks so that what little oxygen there is can be diverted to 'essential' functions such as the brain. This explains why people who are short of breath are so tired and find everything a huge effort - there just isn't the oxygen available to help them do non-essential tasks.

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