Mechanism of Respiration

Explain about mechanism of respiration

1. Respiratory system Physiology of Respiration-Mechanism of Breathing Mr N.JEGAN Associate Professor K.M.COLLEGE OF PHARMACY. MADURAI.

2. Breathing mechanism Breathing consist of two Phases 1.Inspiration: The process of taking in air. 2. Expiration: The process of expel out the air.

3. Muscles of respiration The main muscles of respiration in normal quiet breathing are 1. Intercostal muscles 2.Diaphragm During difficult or deep breathing they are assisted by 1 . Muscles of the neck 2.Shoulders muscle 3.Abdominal muscles

4. Intercostal muscles There are 11 pairs of intercostal muscles that occupy the spaces between the 12 pairs of ribs. They are arranged in two layers 1. External intercostal muscles 2. internal intercostal muscles

5. Diaphragm The diaphragm is a dome-shaped muscle structure. It separating the thoracic and abdominal cavities

6. Inspiration In this process air enter into the lungs from atmosphere. This process is active and requires energy for muscle contraction.

7. Inspiration-Mechanism Intercostal muscles contract they pull all the other ribs towards the first rib. Ribs move up Diaphragm contract and move down Thoracic cavity is enlarged Decrease the alveoli pressure(lungs pressure) Drawing air into the lungs in an attempt to equalize the atmospheric and alveolar air pressures. Air enter in to Lungs Inspiration

8. Expiration-Mechanism Relaxation of the intercostal muscles and the diaphragm Downward and inward movement of the rib cage Pressure inside the lungs exceeds that in the atmosphere Air is expelled from the respiratory tract. Expiration

9. Expiration

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