Respiratory histology Flashcards
(30 cards)
what does the conducting portion of respiratory tract do
Warms, filters and humidifies air
- Transmit to respiratory portion
- NO gas exchange = “Anatomic Dead Space
what makes up conduction portion of tract?
Nasal Cavity, Paranasal sinuses, Nasopharynx,
Trachea
- Primary, Secondary, & Tertiary Bronchi
- Bronchioles, Terminal Bronchioles
what does the respiratory portion of respiratory tract do
Pass air to alveoli for gas exchange
what makes up respiratory portion of respiratory tract?
Respiratory Bronchioles, Alveolar ducts, Alveolar Sacs
what type of cells make up vocal folds?
Nonkeratinized stratified squamous epi
•Protect mucosa from abrasions
what type of cells make up respiratory epithelium?
Pseudostratified ciliated columnar epithelium
what does respiratory epithelium do?
- Protect airway via mucus production
* Transport mucus up and out of respiratory tract via cilia
name cell layers of respiratory epithelium in order from top to down
ciliated
goblet
basal
lamina propria
what type of cells are goblet cells and what do they do?
Modified columnar epithelial cells that synthesize & secrete mucus
what are the four layers of the trachea, top to down?
mucosa
submucosa
cartilaginous
adventitia
what does the epithelium of the trachea contain?
Psuedo-stratifiedcolumnar ciliated
Numerous goblet cells
Elastic, fiber-rich lamina propria
BALT
what does the adventitia of the trachea contain?
trachialis m
what does the epithelium of the bronchi contain?
psuedo-stratifiedcolumnar ciliated
Cells shorter in height –transition to cuboidal
Fewer goblet cells
Increased elastic fibers inlamina propria
what does the epithelium of the bronchiole contain?
Large:simpleciliated columnarSmall: simplecuboidal
Few goblet cellsClubcells
Increased elastic fibers
what are club cells, where are they located?
Non-ciliated, dome-shaped cells
- Secrete a lipoprotein that prevents luminal adhesion w/airway collapse (during expiration)
- Detoxification of inhaled materials
- Secrete antimicrobial peptides
terminal bronchioles
describe epithelia of respiratory bronchioles
Simplecuboidal epi w/ Club cells
elastic fibers
what is so special about respiratory bronchioles?
Mucosa contain openings to alveoli –where gas exchange occurs
what are alveolar sacs?
2+ clusters of alveoli
what are Alveolar rings?
aggregates of smooth muscle, collagen & elastic fibers, that form rings around alveolar ducts
what kind of epithelium is located in alveoli?
Simple Squamous epithelium
alveoli are lined by what kind of cells?
Pneumocytes
type 1 pneumocytes are used for what?
gas exchange
type 2 pneumocytes are used for what?
Secrete surfactant,reduces surface tension within alveoli, preventing collapse during respiration
parietal and visceral pleura are covered with what?
mesothelium
