Respiratory/Digestive Flashcards
Which cavity is superior in the respiratory system?
Nasal cavity
What is the order of the pharynx?
-nasopharynx (connects to nasal cavity; entirely part of respiratory)
-oropharynx (part of digestive as well)
-laryngopharynx (part of digestive as well)
What structure leaves the pharynx and enters the lungs?
Trachea
What is the most superior sinus?
Frontal
What sinuses are inferior to the frontal sinus?
Ethmoid
What is the most inferior sinus
Maxillary
What is the most posterior sinus?
Sphenoid
What are the functions of the respiratory system?
-ventilation (inhalation and exhalation)
-gas conditioning
-sound production
-olfaction
-defense
What structures make up the conducting upper respiratory tract?
Nose and nasal cavities
-main conducting airway for inhaled air
-supported by the pair of nasal bones (form bridge)
-divided into L/R by nasal septum
What is anterior/inferior to the nasal bones
Cartilaginous dorsum nasi
What structures slow down and mix air?
Inferior, middle, and superior nasal conchae (found on lateral wall of each cavity.
What are some components of the nasopharynx
-lined with ciliated pseudostratified columnar epithelium.
-opening of eustachian tube is in lateral wall
-pharyngeal tonsil (adenoid) is found in posterior wall
What are some components of the oropharynx
-lined with nonkeratinized stratified squamous epithelium
-palatine tonsils in lateral wall
-lingual tonsils are at the base of tongue
What are some components of the laryngopharynx
-lined with nonkeratinized stratified squamous epithelium
-continuous with both larynx and esophagus
What are the functions of the larynx?
-passageway for air from pharynx to trachea
-prevents food from entering respiratory tract
-produces sound
-sneeze and cough reflex
What are the nine cartilages in the larynx?
-epiglottis
-thyroid cartilage
-cricoid cartilage
-cuneiform cartilage (paired)
-corniculate cartilage (paired)
-arytenoid cartilage (paired)
What are some components of the thyroid cartilage?
-largest
-anterior projection/laryngeal prominence or adam’s apple
-anterior and lateral walls but no posterior
What are some components of the cricoid cartilage?
-ring shaped
-inferior to thyroid cartilage
What are some components of the epiglottis?
-spoon shaped
-when swallowing, closes the opening to the larynx
What do the paired cartilages deal with?
Sound production
What are some components of the trachea?
-anterior to the esophagus
-supported by c-shaped cartilage semi rings
What are some components of the main bronchi?
-have complete cartilaginous rings around
-branches into lobar and segmental bronchi
-lined with ciliated pseudostratified columnar epithelium
-branch into bronchioles (no rings)
What happens when branching of the bronchi continue?
-incomplete cartilaginous rings become smaller and less numerous
What are some components of bronchioles?
-lined with simple columnar/simple squamous epithelium
-less than 1mm in diameter
-walls contain thick layer of smooth muscle (produces bronchodilation or bronchorestriction)
-branch into terminal bronchioles which are the last tubes of conduction but not the last of bronchioles.
What do terminal bronchioles branch into?
Respiratory bronchioles
What do respiratory bronchioles branch into?
Alveolar ducts
What do alveolar ducts end in?
Alveoli
What are some components of alveoli?
-made up of simple squamous epithelium
-allow for gas exchange
What are alveolar type I cells made up of?
Simple sqamous epithelium (to promote rapid gas exchange within circulatory system)
What do alveolar type II cells produce?
Pulmonary surfactant (reduces surface tension within alveoli to prevent collapse)
What uses phagocytosis to protect alveoli from foreign bodies?
Alveolar macrophages
What does the respiratory membrane do?
BARRIER THAT GASES MUST PASS
THROUGH IN THE LUNGS FOR GAS
EXCHANGE TO OCCUR
What does the respiratory membrane consist of?
-plasma membrane of alveoli
-plasma membrane of capillaries
-fused basement membranes of both cells
What does the fused basement membrane
KEEPS THE TWO CELLS TOGETHER AND
PROVIDES SPACING BETWEEN THE
capillaries around the aveoli