Human Biology

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Chapter 9

• Human Biology
• Seventh Edition
• Mader
• (c) The McGraw-Hill Companies, Inc.

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• Choking is the 6th leading cause of death in U.S.
• More than 20 people a day die from choking.
• Cessation of breathing causes death within 4
  minutes!

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The Respiratory Tract

• The respiratory tract extends from the nose to
  the lungs, which are composed of air sacs called
  alveoli. Gas exchange occurs between air in the
  alveoli and blood within a capillary network that
  surrounds the alveoli. The pulmonary arteriole
  is collored blue- it carries oxygen poor blood
  away from the heart to alveoli. The pulminary
  venule is colored red it carries oxygen rich
  blood from the alveoli toward the heart.

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The Respiratory Tract

• Air is filtered and warmed as it is conducted
  through a series of passages on its way to the
  lungs.
• The nose two nasal cavities containing receptor
  cells, receive tear ducts from the eyes and
  communicate with the sinuses. The auditory tube
  from the middle ear communicates

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The End.