Respiratory Flashcards
FUNCTIONS OF THE RESPIRATORY SYSTEM
• Pulmonary Ventilation
• External Respiration
• Internal Respiration
• Gas Transport
Jutting external portion is supported by bone and cartilage.
Nose
provides an airway for respiration
Nose
Moistens and warms entering air
Nose
filters and cleans inspired air
Nose
serves as a resonating chamber for speech
Nose
houses the olfactory (smell) receptors
Nose
PARANASAL SINUSES
Frontal sinus
Ethmoid sinus
Sphenoid sinus
Maxillary sinus
Nasal cavity
Common passageway of both respiratory and digestive systems.
PHARYNX
Approximately 13cm in length extending from the base of the skull to the sixth vertebrae.
PHARYNX
DIVISION OF PHARYNX
Nasopharynx
Oropharynx
Laryngopharynx
Extends from choanae to uvula.
Nasopharynx
Extends from uvula to epiglottis to oral cavity
Oropharynx
Extends from epiglottis to esophagus
Laryngopharynx
Nasal reflexes
Sneeze reflexes
Photic sneeze reflex
Located in the anterior throat and it connects superiorly to the pharynx and inferiorly to the trachea.
Larynx
Approximately 5cm extending from the 3rd cervical to the 6th cervical vertebrae.
Larynx
Larynx has 9 cartilages
Thyroid cartilage, cricoid cartilage, epiglottis, arytenoid
cartilages, corniculate cartilages, and cuneiform cartilages.
unpaired cartilages of the larynx
Thyroid
Cricoid
Epiglottus
Paired cartilages of the larynx
arytenoid
cartilages, corniculate cartilages, and cuneiform cartilages.
Larynx : folds
Vestibular fold (false vocal cord)
Vocal fold (true vocal cord)
Air passageway and voice production
Vocal Folds
Descends from the larynx through the neck and into the mediastinum.
Trachea
Located anterior to the esophagus and spine.
Trachea
Consists of connective tissue and smooth muscle
Trachea
Has 16-20 C-shaped cartilages
Trachea
divides into the left and right bronchi, each of which connects to a lung.
Trachea
Principal organs of respiration
Lungs
resting on the diaphragm
Base
extending superiorly to a point about 2.5 cm above the clavicle.
Apex
Lungs divided into two:
right and left lung
the site of gas exchange
Alveoli
Location of gas exchange
Lungs (alveoli)
Exchange of gas across respiratory membrane is influenced by:
– Respiratory membrane thickness (must not be too thick)
– Surface area (must be large)
– Lining of the alveolar sac (must be moist)
Inhalation (atmospheric air)
PO2 (16mm Hg)
PCO2 (0.3mm Hg)
Alveolar air
PO2 (104mm Hg)
PCO2 (40mm Hg)
During gas exchange
PO2 (104mm Hg)
PCO2 (40mm hg)
Each lung is surrounded by a separate
Pleural cavities
Each lung is surrounded by a separate
Pleura
Pleura consist of
- Parietal Pleura
- Visceral pleura
produced by the pleural membranes that functions to act as a lubricant and to help hold the pleural membrane together.
Pleural fluid
The process of moving air into and out of the
lungs
Ventilation
Types of ventilation
•Inspiration/ Inhalation
•Expiration/ Exhalation
The tendency for an expanded lung to decrease in size
Lung recoil
Lung recoil occurs because of the following reasons:
- The lungs are made up of elastic connective tissue.
- The alveoli have surface tension.
Note: Too much surface
tension is NOT good
Used to assess pulmonary volume and capacities
Spirometry