Lecture 37 - Respiratory Physiology II

Lecture 37 - Respiratory Physiology II - Thursdays*Class...

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Thursday’s Class RESPIRATORY PHYSIOLOGY II Chapter 11 pp. 452, 456B458, 462B473 Chapter 9 pp. 422, 426B428, 432B443
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What you should be able to do by the end of today’s lecture RESPIRATORY PHYSIOLOGY II Describe the evolutional diversity in respiratory tissues. Explain the strategies used by animals to control ventilation.
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Respiration in Birds Figure 9.22a Lungs are stiff and change little in volume Lungs are between a series of air sacs that act as bellows Posterior and anterior air sacs Gas exchange occurs as air flows through parabronchi in lungs Air flow through parabronchi is unidirectional Blood flow is crosscurrent Parabronchial tubes (like gas capillaries)
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Respiration in Birds Figure 9.23 Requires two cycles of inhalation and exhalation Key point: Gas exchange occurs in parabronchi during both inhalation AND exhalation Thus, birds get twice as much oxygen per breathing cycle as other vertebrates
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Respiration in Birds
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Respiration in Mammals Two main parts to respiratory system Upper respiratory tract Mouth, nasal cavity, pharynx, trachea Lower respiratory tract Bronchi and gas exchange surfaces (alveoli) Alveoli are the site of gas exchange Thin wall of type I alveolar cells (gas exchange) Type II surfactant cells secrete fluid Outer surface of alveoli are covered in capillaries Figure 9.24
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Respiration in Mammals Figure 9.24
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  • Spring '15
  • AnneTodgham
  • Hemoglobin, Thursday’s*Class RESPIRATORY*PHYSIOLOGY*II, Phrenic nerve*activity*during, Myoglobin has*a*higher*

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