Physiological Anatomy of the

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Physiological Anatomy of the Respiratory System
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The respiratory system is divided into two zones
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I- The Conducting Zone
Includes nose, nasopharynx, larynx, trachea and
2 main bronchi one for each lung, and smaller
bronchioles.
Function of the conducting part

• Conducting air into the respiratory zone.
• Air conditioning
• Humidification
• Filtration
• Protective reflexes
• a- Sneezing reflex
• b- Cough reflex
• Non respiratory function

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II- Respiratory Zone
Consists of respiratory units each of which
composed of respiratory bronchioles which
subdivided into alveolar ducts which end in
clusters of small thin walled air sacs called
alveoli
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Respiratory Passages
1-The nose
The nasal cavity is subdivided into there zones
a) The vestibule b) The respiratory area C- The
olfactory area
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The olfactory area is lined by olfactory mucosa
which consists of (A) Olfactory epithelium
consists of three types of cells
1- Sustentecular (supporting) columnar cells
2- Olfactory (sensory) cells
3- Basal cells (B) Corium