Ventilation is actually the object of breathing itself. When the lungs take in oxygen. It can be made difficult by injuries such as broken ribs or anything that makes breathing painful.Perfusion is when the red blood cells carry oxygen throughout the body to adequately distribute it to body tissues. It is a continuous process performed by the cardiovascular system.
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Matching the amount of gas reaching the alveoli to the blood flow in pulmonary capillaries
Exhaust fan is only use for exhaust the old air, while ventilation fan is use for both purpose intake and exhaust.
AC (Air Conditioning) is made for cooling and heating, ventilation that kills microorganisms. HVAC (Heating, Ventilation, Air Conditioning) The V stands for Ventilation and means that it takes air from the outside in to the inside. And AC dosent do that. I can't give any better anwer on that, maybe someone else.
The pipe installed for the purpose of ventilation is known as a vent pipe while a pipe which is installed in a house drainage to preserve the water seal of trap is an anti-siphonage pipe.
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