Respiratory System Flashcards
What are the four parts of the upper respiratory tract?
The external nose
nasal cavity
pharynx
larynx
What are the 3 parts of the lower respiratory tract?
Trachea
Bronchi
Lungs
What is the conducting zone?
The nose -> small air tubes in the lungs strictly for pulmonary ventilation
What is the respiratory zone?
Specialized small tubes and alveoli where gas exchange occurs
What is pulmonary ventilation?
Breathing
What are the main functions of the respiratory system
Pulmonary ventilation and gas exchange
What are the two forms of gas exchange?
Pulmonary gas exchange lungs -> blood
Tissue gas exchange blood->tissues
What functions are “secondary functions” of the respiratory system?
Regulation of blood pH
Production of chemical mediators
Voice production
Olfaction
Protection against microorganisms (prevents entry)
What are the three parts of the pharynx?
The nasopharynx
Oropharynx
Laryngopharynx in that order
What is the larynx?
The voice box
What are the unpaired cartilages in the larynx?
Thyroid
Cricoid
Epiglottis
What are the paired cartilages in the larynx?
Arytenoid
Corniculate
Cuneiform
What 5 special structures does the larynx contain?
Ligaments for speech
Unpaired cartilage
Paired cartilage
Vestibular folds
Vocal folds
What are the main functions of the larynx?
Maintain an open passageway
Prevent swallowed material from moving into the lower tract
Sound Protection
Traps debris and prevents entry into the lower tract
What kind of cartilage is in the Trachea? What is it’s shape?
Hyaline cartilage
a “C”
What muscle is in the trachea?
The trachealis
What is the cartilage at bifurcation in the lungs?
Carina
It is very sensitive to irritation and inhaled objects
It is the structure that initiates the cough reflex
What is the tracheobronchial tree?
The space from the trachea to the terminal bronchioles
What happens to smooth muscle as tube diameter increases? Cartilage?
The amount of smooth muscle increases. The amount of cartilage decreases.
What are the 4 types of passages in the tracheobronchial tree?
Secondary (lobar)
Tertiary (segmental)
Bronchioles
Terminal Bronchioles
How large are bronchioles? What are they made of?
Less than 1 mm in diameter
Made of simple columnar epithelium
What are terminal bronchioles like?
The have no cartilage and lots of smooth muscle. They are made of ciliated simple cuboidal epithelial tissue
What are the tertiary (segmental) branches of the tracheobronchial tree?
They supply the bronchopulmonary segments
What is a secondary (lobar) branch in the tracheobronchial tree?
They each serve a lobe of the lung and contain cartilage plates lined with pseudostratified columnar epithelium
There are three on the right and two on the left
What are the three types of bronchioles?
Bronchioles
Terminal Bronchioles
Respiratory Bronchioles
What are the alveoli?
They are the site of gas exchange in bronchioles
What is unique about alveoli in respiratory bronchioles?
Respiratory bronchioles have very few alveoli
What is inside alveoli?
They have no cilia but a lot of macrophages that remove debris
What are the alveolar sacs?
Chambers connected to two or more alveoli at the end of an alveolar duct
What is an alveolar duct?
They arise from the respiratory bronchioles and alveoli open up from them
What types of cells are in alveoli cell walls?
Type I pneumocytes
Type 2 pneumocytes
What is the function of type I pneumocytes?
They make up 90% of the alveolar surface and are the site of gas exchange
What is function of type II pneumocytes?
They produce surfactant which cuts surface tension making inspiration easier.
What is the respiratory membrane?
The location of gas exchange inside alveoli
It has very thin walls so that exchange can occur easily
What does the diaphragm do for ventilation?
Contraction of the diaphragm increases the volume of the chest cavity drawing air into your lungs.
What are bronchopulmonary segments?
They contain tertiary bronchi and are the area where veins and lymphatics drain along the edges