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Respiratory System Functions [5]
- 1. Gas exchange between air and circulating blood
- 2. Move air to and from gas exchange surface
- 3. Protection from dehydration, temp. changes, and invading pathogens
- 4. Produce sounds. Speech, singing, nonverbal auditory communication
- 5. Olfactory sensations to CNS
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Anatomical Structures of Respiratory System [6]
- 1. Nose
- 2. Pharynx
- 3. Larynx
- 4. Trachea
- 5. Bronchi
- 6. Lungs
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Respiratory Tract
Airways that carry air to and from exchanges surfaces of lungs
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2 Portions of Respiratory Tract
- 1. Conducting Portion
- 2. Respiratory Portion
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Conducting Portion
- Nasal Cavity -> Pharynx -> Larynx -> Trachea -> Bronchi -> Bronchioles
- Warms, humidifies and delivers air to lungs
- Protects alveoli from debris, pathogens and extreme environments
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Respiratory Portion
Smallest bronchioles and alveoli
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Air enters respiratory system through _________ which open into the _________.
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Nasal Vestibule
Space enclosed within flexible tissues of nose
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Nasal Septum
Divides nasal cavity in left and right
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Hard Palate
- Formed by palatine and maxillary bones
- Forms to floor of nasal cavity
- Separates oral and nasal cavity
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Soft Palate
Extends behind hard palate
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Nasal Cavity opens into nasopharynx at the __________.
Internal nares
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Respiratory mucosa
Protective mucus membrane lining respiratory tract
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Pharynx (throat)
- Shared by digestive and respiratory system
- Between internal nares and entrance to larynx and esophagus
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Subdivisions of Pharynx [3]
- 1. Oropharynx
- 2. Nasopharynx
- 3. Laryngopharynx
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Inhaled air leaves the ________ and enters the _________ through the __________.
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Larynx (voicebox)
9 cartilages stabilized by ligaments and skeletal muscles
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3 largest larynx cartilages
- 1. Epiglottis
- 2. Thyroid Cartilage
- 3. Cricoid Cartilage
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Trachea
Begins at C6, attaches to cricoid cartilage, ends at mediastinum, branches to right and left bronchi at 5th thoracic vertebrae
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Tracheal Cartilage
- Supports walls of trachea
- Protects airway
- C shaped
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