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Questions and Answers
What is the main function of the respiratory system?
What is the location of the nasal turbinates?
What is the function of the paranasal sinuses?
What is the purpose of the Eustachian tubes?
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What is the role of the pharyngeal tonsils?
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What is the term for the opening of the nasal cavity?
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What is the function of tonsils in the oropharynx?
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What is the name of the unpaired cartilage that separates the trachea from the esophagus?
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What is the name of the vocal fold that produces sound?
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What is the name of the cartilaginous bridge that divides the trachea into two bronchial trees?
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What type of epithelium is found in the trachea, larynx, and paranasal sinuses?
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What is the function of goblet cells in the respiratory epithelium?
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What is the name of the nerve that innervates the vocal fold?
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What is the name of the membrane that covers the inside of the pleural cavities?
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What is the name of the cells that secrete surfactant in the alveoli?
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What is the function of the diaphragm during inhalation?
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What is the location of the nasal turbinate's structures?
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What is the function of the nasolacrimal duct?
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What is the inferior nasal meatus located below?
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Which bone has ethmoid air cells?
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Where do tears exit through after they have drained from the medial orbit to the nasolacrimal duct?
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What is the primary function of the alveoli in the respiratory system?
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What type of gases fill the alveoli?
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What occurs across the walls of the alveoli?
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What is the purpose of the diffusion of gases in the alveoli?
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Where does the diffusion of gases occur in the respiratory system?
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Where does gas exchange occur in the human body?
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What cervical vertebrae do the larynx sit between?
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Match the following structures with their descriptions:
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Match the following 3 paired cartilages in the larynx with their descriptions:
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The vocal _______________, also known as vocal cords, produce sound and span between the thyroid cartilage anteriorly and the arytenoid cartilage posteriorly.
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What is the function of the vestibular fold, also known as the false vocal cords?
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What cervical vertebrae does the Trachea sit in?
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The trachea branches and ends at ____, than divides into ____bronchial trees.
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Match the following components of trachea histology with their descriptions:
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What is the purpose of serous glands and mucus glands in the respiratory system?
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What is the purpose of the C-shaped hyaline cartilage rings in the trachea?
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Match the following structures of the bronchial tree with their descriptions:
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What is the function of Type I cells or Type I Pneumocyte in the alveoli?
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What is the function of Type II cells or Type II Pneumocyte in the respiratory system?
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Type I Pneumocyte have a high ______, while Type II Pneumocyte secrete surfactant to help ____ surface tension.
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Match the terms related to the lungs with their descriptions:
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What are the surfaces of the lungs?
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Study Notes
Respiratory System Functions
- Divided into Upper Respiratory System (face and neck) and Lower Respiratory System (lower neck and thoracic cavity)
- Transports oxygen into the body and carbon dioxide out of the body
- Exchanges occur in the lungs between RBC in capillaries and lung alveoli, and in the body between RBC in capillaries and body cells
- Helps maintain proper acid-base balance of blood by exhaling CO2, reducing carbonic acid in the blood
- Produces vocal sounds through phonation
Upper Respiratory System
- External Nose
- Consists of root, bridge, dorsum nasi, apex, ala, and external nares (openings)
- Internal Nose
- Consists of vestibule, nasal turbinate (superior, middle, inferior), nasal meatuses (superior, middle, inferior), and paranasal sinuses
- Nasolacrimal duct connects to the nasal cavity
- Mouth and Pharynx
- Oral cavity and pharynx (nasopharynx, oropharynx, laryngopharynx) separated by soft palate
- Tonsils (lingual, palatine) function to detect pathogens from food and air
Larynx and Trachea
- Larynx
- Consists of 9 cartilages (3 paired, 3 unpaired)
- Epiglottis, thyroid cartilage, and cricoid cartilage are the 3 unpaired cartilages
- Paired cartilages include arytenoid, corniculate, and cuneiform cartilages
- Vocal folds (vocal cords) produce sound, innervated by recurrent laryngeal nerve
- Vestibular fold/ligament (false vocal cords) keeps food and drinks out of the airways
- Trachea
- Located from C6 to T5, dividing into two bronchial trees at T5
- Carina is a cartilaginous bridge that divides into the two bronchial trees
Trachea Histology
- Mucosa
- Respiratory epithelium (pseudostratified columnar ciliated epithelium with goblet cells)
- Goblet cells not stained, but important for mucous production
- Lamina propria
- Loose connective tissue that attaches respiratory epithelium to submucosa
- Submucosa
- Contains seromucous glands (serous glands and mucus glands with goblet cells)
- Hyaline cartilage
- 16-20 C-shaped rings that suspend the airway open
- Not full rings to avoid interfering with esophagus function
Bronchial Tree
- Primary/Main Bronchi (2)
- Secondary/Lobar Bronchi (3 on the right, 2 on the left)
- Tertiary/Segmental Bronchi (10 on the right, 10 on the left)
- Bronchioles (cartilage rings disappear)
- Terminal Bronchioles
- Respiratory Bronchioles (one per lobule)
- Alveolar Ducts
- Alveoli (Alveoli) – Gas exchange
Alveoli
- Type I cells (Type I Pneumocyte)
- Simple squamous epithelium for efficient gas diffusion
- Many capillaries wrap around the alveolus for gas exchange
- Type II cells (Type II Pneumocyte)
- Secrete surfactant to decrease surface tension, preventing alveolar collapse
- Allow for easy breathing in and out
Lungs
- Pleura – serous membrane that covers inside of the pleura cavities
- Parietal pleura and Visceral pleura
- Apex projects above Rib 1
- Base sits on diaphragm
- Lungs expand and contract with diaphragm movement
- Surfaces: posterior, costal, anterior, and medial
- Lobes: Right Side (superior, middle, inferior), Left Side (superior, inferior)
- Fissures: Horizontal fissure (between superior and middle lobes), Oblique fissure (between middle and inferior lobes)
- Cardiac Notch – a cut on the left lung for the heart
Nasal Cavity Structure
- The vestibule is the anterior space where air enters after passing through the nares
- Nasal turbinate bones, also known as nasal conchae, have three structures: • Superior nasal conchae: part of the ethmoid bone • Middle nasal conchae: part of the ethmoid bone • Inferior nasal conchae: part of the facial bone
Nasal Meatuses
- Nasal meatuses are tubular pathways created by nasal turbinate bones
- Three types of nasal meatuses: • Superior nasal meatus: below superior conchae • Middle nasal meatus: below middle nasal conchae • Inferior nasal meatus: below inferior nasal conchae
Paranasal Sinuses
- Four types of paranasal sinuses: • Maxillary sinuses: in maxillary bones • Ethmoid air cells: in ethmoid bones • Sphenoid sinuses: in sphenoid bone
Nasolacrimal Duct
- Transports tears from the medial aspect of the orbit to the nasal cavity
- Located below the inferior nasal conchae
- Drains into the inferior nasal meatus
Respiratory System Functions
- The respiratory system is divided into the upper respiratory system (face and neck) and the lower respiratory system (lower neck and thoracic cavity)
- The main functions of the respiratory system are:
- Transport of oxygen into the body
- Transport of carbon dioxide out of the body
- Exchange of oxygen and carbon dioxide occurs at the lungs and the body
- Help maintain proper acid-base balance of blood
- Produce vocal sounds through phonation
Upper Respiratory System
- The external nose consists of:
- Root bridge
- Dorsum nasi
- Apex
- Ala
- External nares (openings)
- The internal nose consists of:
- Vestibule
- Nasal turbinate (aka nasal conchea)
- Nasal meatuses
- Paranasal sinuses
- Nasolacrimal duct
- The nasal turbinate creates tubular pathways called nasal meatuses
- Superior nasal meatus
- Middle nasal meatus
- Inferior nasal meatus
Pharynx
- Divided into three parts:
- Nasopharynx
- Oropharynx
- Laryngopharynx
- Nasopharynx:
- Receives from middle ear via Eustachian tubes
- Contains pharyngeal tonsils or adenoids
- Function as part of immune system, detecting pathogens
- Oropharynx:
- Separated from nasopharynx by soft palate
- Contains lingual tonsils and palatine tonsils
- Tonsils function to detect pathogens from food and air
Larynx
- Location: C4-C6
- Consists of 9 cartilages (3 paired and 3 unpaired)
- Unpaired cartilages:
- Epiglottis
- Thyroid cartilage
- Cricoid cartilage
- Paired cartilages:
- Arytenoid cartilages
- Corniculate cartilages
- Cuneiform cartilage
- Unpaired cartilages:
- Vocal fold (vocal cord) produces sound
- Innervation: recurrent laryngeal nerve (branch of Vagus nerve)
- Vestibular fold (false vocal cords) keeps food and drinks out of the airways
Trachea
- Location: C6-T5
- Divides into two bronchial trees at T5
- Carina: a cartilaginous bridge that divides into two bronchial trees
- Trachea histology:
- Mucosa:
- Respiratory epithelium (pseudostratified columnar ciliated epithelium with goblet cells)
- Lamina propria (loose connective tissue)
- Submucosa:
- Contains seromucous glands
- Hyaline cartilage (16-20 C-shaped hyaline cartilage to suspend airway open)
- Mucosa:
Bronchial Tree
-
- Primary/main bronchi (2)
-
- Secondary/lobar bronchi (3 on the right, 2 on the left)
-
- Tertiary (third division)/segmental bronchi (10 on the right, 10 on the left)
-
- Bronchioles
-
- Terminal bronchioles
-
- Respiratory bronchioles
-
- Alveolar ducts
- Alveolus (alveoli) - gas exchange
Alveoli
- Type I cells (Type I Pneumocyte):
- Simple squamous epithelium
- Many capillaries wrap around the alveolus
- Gas exchange occurs here
- Type II cells (Type II Pneumocyte):
- Secrete surfactant
- Decrease surface tension, allowing for easier breathing
- Prevent the collapse of alveoli on exhalation
Lungs
- Pleura: serous membrane that covers the inside of the pleural cavities
- Parietal pleura
- Visceral pleura
- Apex: projects above Rib 1
- Base: sits on diaphragm
- Diaphragm contracts and pulls the lungs down, expanding it and allowing for air to enter
- Decreases pressure in lungs, allowing gas to enter
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