Block 4 Flashcards
The airways are used for airway conduction. Which of the following structures are associated with the airways?
a) Nasal cavities
b) Pharynx
c) Larynx
d) Trachea and bronchial tree
e) all of the above
e) all of the above
What organ is responsible for gas exchange?
Lungs
What is the associated structure to the lungs that assist in gas exchange?
a) Bronchioles
b) Capillaries
c) Pleural sacs
c) Pleural sacs
What is the structure located midline between the external nares?
a) Alar fold
b) Nostril
c) Nose pad
d) Philtrum
d) Philtrum
Caudal ventral passage from the nasal cavity into the pharynx
Choana
What number on the picture correlates with the ventral nasal concha?
2 - Ventral nasal concha
What number correlates on the picture with the dorsal nasal concha?
3 - Dorsal nasal concha
The olfactory mucosa is responsible for sense of smell. It is located on the ethmoconchae. What number correlates to that structure?
4) Ethmoconchae
What number correlates with the hard palate?
6 - Hard palate
What number correlates with the vomer (resected)?
7 - Vomer
Cavities in bones of the skull that communicate with the nasal cavities
Paranasal sinuses
What is the landmark for the entrance to maxillary recess?
Carnassial tooth
What are the names of structures on the image?
Top - Frontal sinus
Bottom - Maxillary recess
The pharynx is the crossroad between what?
Respiratory and digestive ways
What structure is placed ventrally to the soft palate?
Oropharynx
What is the oral limit of the oropharynx?
Palatoglossal arches
What is the major caudal limit of the oropharynx?
Base of epiglottis
What structure is placed dorsally to the soft palate?
Nasopharynx
What is the oral limit of the nasopharynx?
Choanae
What is the major caudal limit of the nasopharynx?
Free border of soft palate
What structure is placed dorsally to the larynx?
Laryngopharynx
What is the major oral limit of the laryngopharynx?
Free border of the soft palate
What is the caudal limit of the laryngopharynx?
Pharyngoesophageal limen
What are the three divisions of the pharynx?
Oropharynx
Nasopharynx
Laryngopharynx
What structure is responsible for coughing, phonation, and preventing food aspiration?
Larynx
Ventral to the pharynx, suspended by the hyoid apparatus and attached to the trachea. What structure is described?
Larnyx
What are the 4 cartilages that make up the larynx? Which one is paired?
Epiglottis
Thyroid
Arytenoid - PAIRED
Cricoid
What is the most narrow segment of the larynx which can be closed?
Glottis
Vocal folds and part of the arytenoid cartilages
Glottis
Space defined by the glottis
Rima glottidis
Located on the sagittal plane at the ventral aspect of the neck and centrally in the thoracic cavity
Trachea
Gas exchange occurs in the _________ where O2 and CO2 traverse the air-blood barrier
Alveoli
The left lung is divided into what lobes?
Cranial - which is further divided in cranial and caudal parts
Caudal lobe
What are the right lung lobes?
Cranial lobe
Middle lobe
Caudal lobe
Accessory lobe
The main circulation of lungs is divided into the pulmonary trunk and pulmonary veins. Which structure is responsible for drainage?
Pulmonary veins
The pulmonary trunk is further divided into 2 pulmonary arteries who’s main purpose is what?
Supply
Each lung is pushed into a closed invaginated sac filled with a bit of fluid called what?
Pleural cavity
What pleura adhere to the surface of the lung? What number on the diagram correlates with this structure?
4 - Visceral or pulmonary pleura
What pleura adhere to the inner wall of the thorax? What number correlates with this structure?
1, 2, 3 - Parietal pleura
What is the role of the pleura and pleural cavities?
To prevent surface of the lungs from rubbing against thoracic wall during breathing (think “engine oil”)
What label marks the location of the olfactory mucosa?
4 - olfactory mucosa
Normal, quiet breathing
Eupnea
Increased breathing depth, frequency or both
Hyperpnea
Rapid, shallow breathing (ie panting)
Polypnea
O2 consumption and CO2 production vary with the ________ metabolism and metabolic rate
Basal
The metabolism rate of the resting animal, and is a function of metabolic body weight
Basal metabolism
Metabolic rate is dependent on the animals level of ______ and ______ _________
Metabolic rate is dependent on the animals level of activity and physical condition
VO2 max is ______ related to the total mass of _______ within the skeletal muscles
VO2 max is directly related to the total mass of mitochondria within the skeletal muscles
True or False
Gas exchange occurs in the conducting zone/anatomic dead space. Explain answer.
FALSE
Gas exchange does NOT occur in these pathways.
Conducting zone brings air into and out of the respiratory zone FOR gas exchange but does not OCCUR there.
What structure is important to humidify, warm and filter the air before it reaches the gas exchange area?
Conducting Zone
What 7 structures are included in the conducting zone?
Nasal cavity, nasopharynx, larynx, trachea, bronchi, bronchioles, terminal bronchioles
The conducting zone, made up of the tracheobronchial tree, contain mucus secreting and ciliated cells which allow for what?
Filtering of small particles that enter the airway. They are swept upward by the rhythmic beating of the cilia.
The walls of the conducting airways contain smooth muscle and innervation of the sympathetic and parasympathetic nervous systems. In the case of the sympathetic system, what is the purpose of epinephrine?
It dilates the airways making it easier to breathe in flight/fight
The walls of the conducting airways contain smooth muscle and innervation of the sympathetic and parasympathetic nervous systems. In the case of the parasympathetic system, what is the purpose of Acetylcholine?
It constricts the airways to allow rest/digest
In what zone does gas exchange occur?
Respiratory zone
The respiratory zone includes what structures?
Respiratory bronchioles
Alveolar ducts
Alveolar sacs
Thin walled, pouch like evaginations of the walls of the respiratory bronchioles, alevolar ducts, and sacs that provide more surface area and are covered by capillaries
Alveoli
In the respiratory zone, the alveolar walls contain 2 types of _________ cells. What are they?
Epithelial; Pneumonocytes and macrophages
What type of pneumonocyte covers 95% of the alveolar surface? (It is extremely thin, efficient for gas exchange between the alveolus and pulmonary capillaries.)
Type 1 pneumonocyte
This pneumonocyte synthesizes pulmonary surfactant to reduce surface tension of alveoli and prevent it from collapsing.
Type II Pneumonocyte
What pneumonocyte secretes cytokines?
Type II pneumonocyte
First line of defense against invading respiratory pathogens and remove inhaled particles from the alveolus.
Macrophages
What respiratory structures DO NOT have cilia?
Alveolar ducts and alveolar sacs
What part of the respiratory contain cartilage?
a) Trachea
b) Bronchi
c) Bronchioles
d) Alevoli
e) a and b
f) all of the above
e) a and b
What respiratory structure contains no smooth muscle, cilia or cartilage?
Alveolar sacs
Respiration consists of 4 distinct processes:
- Pulmonary ventilation
- Pulmonary gas exchange
- Gas transport
- Peripheral gas exchange
What two structures promote pulmonary ventilation?
Diaphragm and intercostal muscles
Pulmonary gas exchange is diffusion of gases from the ________ to the ________ of the pulmonary capillaries
Pulmonary gas exchange is diffusion of gases from the alveoli to the blood of the pulmonary capillaries
Peripheral gas exchange is diffusion of ______ from the ______ of the _______ ________ to the cells.
Peripheral gas exchange is diffusion of gases from the blood of the Systemic capillaries to the cells.
Respiratory pressure is always described relative to ________ _______
Respiratory pressure is always described relative to atmospheric pressure
Inhalation requires active contraction of what structures?
a) Diaphragm
b) External intercostal muscles
c) Abductor muscles attached to external nares, pharynx and larynx
d) all of the above
d) all of the above
Inhalation _______ intrapulmonary volume and _______ pressure (air inhaled)
(blanks: increase or decrease?)
Inhalation increases intrapulmonary volume and decreases pressure (air inhaled)
Exhalation _______ intrapulmonary volume and _______ pressure (air exhaled)
(blanks: increase or decrease?)
Exhalation decreases intrapulmonary volume and increases pressure (air exhaled)
In inhalation the diaphragm __________ and moves down. In Exhalation, the diaphragm _______ and moves up.
In inhalation the diaphragm contracts and moves down. In exhalation, the diaphragm relaxes and moves up.
What is the major nonelastic source of resistance to airflow
Frictional resistance
Resistance is determined primarily by the ______ of the airways.
Resistance is determined primarily by the radius of the airways