Forced expiration muscle

• Muscles of forced expiration

  • Abdominals
  • Internal intercostals
• Forced Expiration:

  • Forced expiration is brought about by the internal intercostals and the abdominal muscles
• Forced Expiration:

  • Contraction of the abdominal muscles causes the abdominal viscera to push up against the diaphragm reducing the vertical diameter of the thorax