Respiratory Flashcards
Respiratory functions
Gas exchange
Communication
Olfaction
pH regulation
Nose functions
Warm
Cleanse
Humidify
Detects odors
Amplifies sound
Protection
Nose structures
Nostrils
Nasal cavity
Nasal septum
Nostrils
External openings
Nasal cavity
Internal chamber
Nasal cavity structures
Conchae
Meatus
Nasal conchae
Tissue folds with blood and mucus that warm and humidify incoming air
Nasal meatus
Separates the conchae
Passage for air
Nasal septum
Separate the cavities
Pharynx functions
Carries air between the nasal cavity and the larynx
Parts of the pharynx
Nasopharynx
Oropharynx
Laryngopharynx
Nasopharynx
Ciliated pseudo-stratified columnar epithelium
Passage for air
Oropharynx
Stratified squamous epithelium
Passage for air and food
Laryngopharynx
Stratified squamous epithelium
Passage for air and food
Larynx functions
Carries air between and pharynx and trachea
Preventing food from entering the trachea
Sounds production
Parts of the larynx
Glottis
Vestibular folds
Vocal chords
Cartilage
Glottis
Airway surrounded by the larynx
Vestibular folds
Muscles that protect the airway by preventing food from entering the trachea
Vocal chords
Muscles that produce sound
Larynx cartilage
Epiglottis
Thyroid cartilage
Cricoid cartilage
Epiglottis
Uppermost portion of the larynx
Elastic cartilage
Prevents food from entering the glottis
Thyroid cartilage
(Adam’s Apple)
Middle portion of larynx
Shield
Hyaline cartilage
Surrounds vocal chords
Cricoid cartilage
Bottom portion of the larynx
Hyaline cartilage
Connects larynx to the trachea
Trachea
Connection btw larynx and bronchial tree
Ciliates pseudostratified columnar epithelium
C-shaped cartilage rings give support
Bronchial tree
Network of highly branched air tubes
Top three
-Ciliated pseudostratified columnar epithelium
- supported by cartilage
Bottom three
- Ciliated stratified cuboidal epithelium
- supported by muscle
Structures of the bronchial tree
Main bronchi
Lobar bronchi
Segmental bronchi
Bronchioles
Terminal bronchioles
Respiratory bronchioles
Main bronchi
Largest
Right and left that go to each lung
Lobar bronchi
Main bronchi split into each lobe
Segmental bronchi
Branches off of the lobar bronchi
Bronchioles
Continuation of the segmental bronchi
Transition in tissue
Transition from skeletal muscle to smooth muscle
Terminal bronchioles
Branches off of the bronchioles
Cilia
No more mucus
Respiratory bronchioles
Start to lose smooth muscle and cilia
Alveoli
Air sacs on the respiratory branches and alveolar ducts
Main site of gas exchange
Types of cells
Type 1: squamous
Type 2: great
Type 3: alveolar macrophages
Type1: squamous
Alveoli cells
Gas exchange
Type2: great
Alveoli cells
Produce surfactant
Prevents alveoli from sticking to themselves and helps them reinflate
Type3: alveolar macrophages
Alveoli cells
White blood cells
Clean dust and bacteria from alveoli
Lung lobes
Right- three lobes
Left- two lobes
Plurae
Serious membrane that surrounds lungs and lines the thoracic cavity
Reduces friction
Creates pressure gradient
Prevent infections from spreading
Three layers:
- parietal
- visceral
- pleural cavity
Visceral pleura
Surrounds the lungs
Parietal pleura
Lines the thoracic cavity
Pleural cavity
Space between parietal and visceral pleura
Has serous fluid
Types of pressure
Atmospheric
Partial
Atmospheric pressure
Force exerted on surfaces by molecules of air
TAP= combined pressure of each component in air
Atmospheric pressure at sea level
760mmHg
Partial pressure
Pressure of each specific component in air
Composition of air
78% nitrogen
21% oxygen
1% carbon dioxide
Trace amounts of other elements and water vapor
Steps of inhalation
Muscles contract
Thoracic cavity volume increases
Pressure in lungs decreases to 756mmHg
Air is forced into lungs
Steps of expiration
Muscles relax
Thoracic cavity volume decreases
Pressure in lungs increases to 763mmHg
Air is forced out
Respiration centers in the medulla oblongata
Central respiratory group- sets the rhythm of breathing
Dorsal respiratory group- adapts to varying conditions
Respiratory center in the pons
Pneumotaxic center- regulates the between inhalation and expiration in quiet breathing
Oxygen transport
Hemoglobin in red blood cells
Dissolved gas in plasma
Carbon dioxide transport
Bicarbonate ion (HCO3)
Hemoglobin
Dissolved gas in plasma
Bicarbonate transport of carbon dioxide
-CO2 enters the blood and combines with water to form carbonic acid
- this dissociates and becomes bicarbonate ions and hydrogen ions
- the bicarbonate in transported to the lungs where it combines with hydrogen to become carbonic acid
- this dissociates into carbon dioxide and water
- the carbon dioxide is exhaled and the water remains in the plasma