EX. 22 MECHANICS OF RESPIRATION

• Phases of external respiration

  Determine the phases
• Chest diameters


  • Determine the diameters
  • Determine the changes in these diameters during respiration
• Role of ribs and diaphragm


  • Determine how they change the chest diameters
• Muscles involved in


  • Quiet respiration
  • Forced respiration
• Procedure


  1. Allow student to strip to waist and sit with arms symmetrical and chest evenly illuminated

  2. Observe subject breathing quietly and note changes in diameters and movements of ribs and abdominal wall

  3. Observe subject breathing deeply and note differences from quiet breathing
• Active respiration


  Respiration involving muscle contraction
• Passive respiration


  Respiration without muscle contraction