Module 10: Respiratory System Flashcards
Resp. Tract
Upper resp tract
- nose
- pharynx
- larynx
Lower resp tract
- trachea
- bronchial tree
- lungs
Respiratory Mucosa: structure
- ciliated, pseudostratified columnar epithelium lines most of tract
- stratified squamous epithelium lines nostrils, vocal cords, and pharynx
- simple squamous epithelium lines alveoli
Respiratory mucosa:
Function
-protection
- air purification
- ciliary escalator
Upper resp tract: nose
Structure
- external nares
- nasal septum; R and L nasal cavities
- Frontal, maxillary, sphenoid, and ethmoid sinuses
- lacrimal sacs
- superior, middle and inferior nasal conchae (turbinate)
Function
- warms, filters and moistens inhaled air
- olfactory receptors
Upper resp. tract: pharynx
Structure
- nasopharynx, oropharynx, and laryngopharynx
- two nasal cavities, mouth, esophagus, larynx, and auditory tubes (Eustachian tubes) open into pharynx
-pharyngeal, lingual, and palatine tonsils
Function:
- passageway for food and liquids
- passageway for air and air distribution
Upper resp tract: larynx
Structure
- thyroid cartilage (adams apple), cricoid cartilage, and epiglottis
- glottis
- vocal cords
Function
- air distribution and passageway for air movement
- voice production
Lower resp. tract: trachea
Structure
- tube approx. 11 cm long and 2.5 cm wide
- extends from larynx into the thoracic cavity
- c-shaped rings of cartilage
Function
- patent airway
- passageway for air movement
- tracheal obstruction
Pulmonary ventilation
-mechanics of breathing
-regulation of breathing
- breathing patterns
Lower resp. tract
structure and function
- trachea> R and L bronchi > secondary bronchi > bronchioles> alveolar ducts> alveolar sacs > alveoli = alveolar air movement and distribution
- Alveoli
Structure:
- surfactant- covered respiratory movement
*type 1 alveolar cells
*type 11 alveolar cells
Function:
- gas exchange between air and blood
Lower resp tract: lungs
Structure:
- size: fills the chest cavity, except for middle space occupied by heart, large blood vessels, thymus, and esophagus
*apex (superior)
*base (inferior)
Pleurae
- membrane lining the thoracic cavity (parietal pleura) and covering the outer surface of each lung (visceral pleura)
Pulmonary Ventilation
Respiration
1. pulmonary ventilation
2. external respiration
3. internal respiration
Mechanics of breathing
- pulmonary ventilation
*inspiration (inhalation)
*expiration (exhalation)
Regulation of Ventilation
-Homeostasis of Blood gases
- brainstem control of respiration
*medullary centres
*pontine centres
- cerebral cortex control of respiration
- respiratory reflexes
*chemoreflexes
*pulmonary stretch reflexes
Breathing Patterns
-Eupnea
-Hyperventilation
-Hypoventilation
-Dyspnea
- Apnea
- Resp arrest
- cheyne-stokes respiration
Glossary: Adenoid
Literally, glandlike; adenoids, or pharyngeal tonsils, are paired lymphoid structures in the nasopharynx
Glossary: Alveolar duct
airway that branches from the smallest bronchioles; alveolar sacs arise from alveolar ducts
Glossary: Alveolar sac
each alveolar duct ends in several sacs that resemble a cluster of grapes
Glossary: Alveoli
literally, a small cavity; alveoli of lungs are microscopic saclike dilations of terminal bronchioles
Glossary: Aortic body
small cluster of chemosensitive cells that respond to carbon dioxide and oxygen levels
Glossary: Apnea
temporary cessation of breathing
Glossary: auditory tube (eustachian tube)
Tube that connects the throat with the middle ear to equalize air pressure on both sides of the tympanum (eardrum) ; also called eustachian tube
Glossary: Bicarbonate ion (HCO3-)
Negative ion common in water solutions, including body fluids; HCO3-; often acts as a buffer to increase pH (reduce acidity) of a solution
Glossary: Bronchi
The branches of the trachea
Glossary: Bronchiole
small branch of a bronchus
Glossary: Carbaminohemoglobin (HbCO2)
the compound formed by the union of CO2 with hemoglobin