Respiratory System Flashcards
What is the surface of the external nose covered by?
keratinized stratified squamjous epithelium
What is present in varying amounts in the keratinized stratified squamous epithelium of a dog’s nose?
pigment
What is the shape of a nose determined by?
internal hyaline cartilage
What 2 parts can the respiratory system be subdivided into?
conductive part and respiratory part
What does the ‘conductive’ part of the respiratory system include?
all tubular organs in the tespiratory system:
- nose
- oropharynx
- larynx
- trachea
- primary bronchi
What is the function of the ‘conductive’ part of the respiratory system?
air way passage
- air is simply being let through to reach its final destination
What does the ‘respiratory’ part of the respiratory system include?
- respiratory bronchioles
- alveoli of the lungs
What is the function of the ‘respiratory’ part of the respiratory system?
most important function: GAS EXCHANGE!
carbon dioxide and oxygen exchange
State the composition of the external nose. Core? Covering? Distinctive feature?
core: hyaline cartilage
covering: keratinized stratified squamous epithelium
distinctive feature: thicker than skin –> grooves form
What is a nasal cavity?
a paired chamber seperated by a bony and cartilaginous septum
What is a nasal vestibule?
A dilated space of the nasal cavity just inside the nostrils.
lined by skin
What is the nasal vestibule lined by?
skin
What region is the largest part of the nasal cavities? What is it lined by?
Respiratory region!!
- inferior 2/3
- lined by respiratory mucosa
What region is the smaller part of the nasal cavities? What is it lined by?
Olfactory region!
- upper 1/3
- lined by specialized olfactory mucosa
What 3 parts is the nasal cavity divided into?
- nasal vestibule
- respiratory region
- olfactory region
What is the olfactory region known for?
- sensory function
- specific cells helping smell sensing
State the general function of the nasal vestibule.
- forms a part of the external nose
- communicated anteriorly with the external environment
State the composition (histological level) of the nasal vestibule.
- lined with stratified squamous epithelium (a continuation of the skin of the face)
- contains a variable number of vibrissae (entrap large particulate matter before it is carried in the air stream to the rest of the cavity)
- contains sebaceous glands (secretions assist the entrappment of particulate matter)
State the histological composition of the respiratory region of the nasal cavity.
- lined by respiratory mucosa containing a ciliated, pseudostratified columnar epithelium on its surface
pseudostratified columnar epithelium of the respiratory mucosa is composed of 5 cells:
- ciliated cells (tall columnar cells with cilia that project into the mucous covering the surface of the epithelium)
- goblet cells (synthesize and secrete mucous)
- brush cells (cells bearing short, blunt microvilli)
- basal cells (stem cells)
What 4 types of cells does the pseudostratified columnar epithelium of the respiratory mucosa consist of?
- ciliated cells (tall columnar cells with cilia that project into the mucous covering the surface of the epithelium)
- goblet cells (synthesize and secrete mucous)
- brush cells (cells bearing short, blunt microvilli)
- basal cells (stem cells)
What are ciliated cells?
tall columnar cells with cilia which projects into the mucous covering the surface of the epithelium
What are goblet cells?
cells synthesizing and secreting mucous
What are brush cells?
cells bearing short, blunt, microvilli
- carry the trapped mucous particle towards the outside of the organism
What are basal cells?
stem cells from which the other types of cells arise
- integrated with the basal lamina