Respiration can be a broader expression that encompasses both of those external respiration (gas exchange within the lungs) and cellular respiration (the procedure by which cells use oxygen to create energy and release carbon dioxide as being a byproduct). Exhaust Vents: These vents expel stale or polluted air in the https://ventilation-ductwork89901.topbloghub.com/43875376/ventilation-ductwork-an-overview