Gaseous exchange 3.0 / 5 based on 1 rating ? BiologyGaseous exchangeGCSEAQA Created by: emmajane_Created on: 12-05-14 18:55 How does a manual ventilator work? A mast atached to a bag is placed over mouth. Bag squeezed, pushing air into lungs 1 of 9 What are the two types of mechanical ventilators? Negative pressure machines and positive pressure machines 2 of 9 When is a negative ventilator used? In cases of paralysis 3 of 9 How does a negative pressure ventilator work? Patients thorax is contained inside a metal box that can create low pressure outside the lungs. This causes thorax to expand so air enters the lungs 4 of 9 How does a positive pressure ventilator work? Attach by a tube and mask to mouth and nose. Air enters lungs under high pressure 5 of 9 When is a positive pressure ventilator used? During surgery or when patient is unconcience 6 of 9 What type of surface helps oxygen to dessolve so that it can diffuse into cells? A moist surface 7 of 9 How is the concentration gradient maintained by? 1. Blood removing oxygen from and bring CO2 to the lungs 8 of 9 Why are capillaries so close to the alveoli? So the gas has a shorter distance to diffuce 9 of 9
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