Respiration - Histology and Anatomy Flashcards
What make up the conducting portion of the respiratory system?
Nasal Cavity Nasopharynx Oropharynx Larynx Trachea Bronchi Bronchioles
What make up the respiratory portion?
Respiratory Bronchioles - open to some alveoli
Alveolar Ducts - ubiquitous openings
Alveolar Sacs - many openings
What is the conducting portions epithelia?
What is the exception and what is that epithelia
Pseudostratified, Ciliated, Goblet Cells
Simple columnar, Clara cells, ciliated
What is the epithelia of the respiratory portion?
Simple cuboidal, Clara cells, sparse cilia
Nasal Cavity regions and their feature?
Hint: Olfactory, Non-olfactory
Olfactory: particularly thick, no goblet cells, have microvilli, contain olfactory cells
Non: Pseudostratified, Ciliated, with mucous glands and venous sinuses
Larynx features
True and False Vocal cords
Vocal cords are lined with stratified squamous epithelia
Stop aspiration and allow a pressure build up (coughs)
Trachea features
About 10cm long
C-shaped cartilage, allow flexibility
Epithelial submucosal glands- mucins, h20, proteins
Lymphocytes- IgA
Bronchi features
Pseudostratified, Ciliated, Goblet cells, Cartilage rings
2ndary and Tertiary- irregular cartilage, crescent shaped
Bronchiole features
Less than 1mm
Epithelia become columnar then cuboidal
Lack cartilage so can collapse with excessive SM contraction
Terminal Bronchiole features
Less than 0.5cm diameter
Clara Cells
Columnar -> Cuboidal Epithelia
Lack Cartilage
Describe Clara cells
Inbetween Ciliated Cuboidal cells
Secrete Surfactant to prevent sticking
Secrete CC16 - marker in lung damage
Describe alveoli
Abundant capillaries
Type I pneumocytes - squamous cells, 90%, GE
Type II - cuboidal, 10% area, produce surfactant
Numerous Macrophages
