Lung Ventilation
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10 questions
| 🇬🇧 | 🇬🇧 |
| What are the values of partial pressure in alveolar air | PO2 --> 13.3 kPa pCO2 --> 5.3 kPa |
| Partial pressure in venous blood | PO2 --> 6 kPa pCO2 --> 6.5 kPa |
| What is the movement of air with reference to partial pressure values | PO2 in alveolar gas > pO2 in returning blood pCO2 in alveolar gas < pCO2 in returning blood So oxygen will diffuse into blood and carbon dioxide out |
| What are factors that determine the rate of diffusion | Area Resistance to diffusion Gradient of partial pressure |
| What is Henry's law | The solubility (at equilibrium) of a gas in a liquid is directly proportional to the partial pressure of that gas. P = kHc P → partial pressure C → concentration K → solubility of the substance H → henry’s law constant |
| What is used to measure of ventilation | Spirometer |
| What is the certain volume which enters and leaves with lungs with each breath | Tidal Volume ( 0.5 L ) |
| What is the maximum lung volume not used in normal respiration | Inspiratory Reserve Volume ( 3.3 L ) |
| What is the residual volume that remains after forced expiration | Residual Volume ( 0.8L ) |
| What is dead spac | Only part of the inspired air is therefore available for gas exchange - the remainder is contained in Dead Space and undergoes no interaction with the blood. This is known as Serial Dead Space |