Breathing

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  • Breathing
    • Ventilation is Breathing In and Out
      • Inspiration
        • The intercostal and diaphragm muscles contract
          • This causes the ribcage to move upwards and outwards and the diaphragm to flatten, increasing the volume of the thorax
            • As the volume of the thorax increases the lung pressure decreases
              • This causes air to flow intro the lungs
                • Inspiration is an active process - it requires energy
      • Expiration
        • The intercostal and diaphragm muscles relax
          • The ribcage moves downwards and inwards and the diaphragm becomes curved again
            • The thorax volume decreases, causing the air pressure to increase
              • air is forced out of the lungs
                • Expiration is a passive process - it doesnt require energy
    • Tidal volume is the volume of air in a normal breath
      • Tidal volume is the volume of air in each breath
      • Ventilation rate is the number of breaths per minute
      • Pulmonary ventilation is the product of tidal volume and ventilation rate. Pulmonary ventilation = Tidal volume X Ventilation Rate

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