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Respiratory System
Anatomy and Physiology
36
Medical
Professional
01/09/2014

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Term
pharynx
Definition
the part inside your mouth where the passages of the nose connect to your mouth and throat
Term
Larynx
Definition
the part of your throat that contains the vocal cords
Term
nasopharynx
Definition
the upper part of the pharynx continuous with the nasal passages
Term
oropharynx
Definition
the part of the pharynx that is below the soft palate and above the epiglottis and is continuous with the mouth
Term
hypopharynx
Definition
the laryngeal part of the pharynx extending from the hyoid bone to the lower margin of the cricoid cartilage
Term
nares
Definition
the pair of openings of the nose or nasal cavity
Term
nostrils
Definition
either of the external nares; broadly : either of the nares with the adjoining passage on the same side of the septum
Term
nasal septum
Definition
the bony and cartilaginous partition between the nasal passages
Term
turbinates
Definition
of, relating to, or being a nasal concha
Term
conchae
Definition
the largest and deepest concavity of the external ear
Term
sinuses
Definition
a cavity in the substance of a bone of the skull that usually communicates with the nostrils and contains air
Term
trachea
Definition
the main trunk of the system of tubes by which air passes to and from the lungs that is about four inches long and somewhat less than an inch in diameter, extends down the front of the neck from the larynx, divides in two to form the bronchi, has walls of fibrous and muscular tissue stiffened by incomplete cartilaginous rings which keep it from collapsing: also called "windpipe"
Term
bronchi
Definition
either of the two primary divisions of the trachea that lead respectively into the right and the left lung
Term
lungs
Definition
saccular organs that constitute the basic respiratory organ of air-breathing vertebrates, that normally occupy the entire lateral parts of the thorax
Term
alveoli
Definition
any of the small thin-walled air-containing compartments of the lung that are typically arranged in saclike clusters into which an alveolar duct terminates and from which respiratory gases are exchanged with the pulmonary capillaries
Term
diaphragm
Definition
inspiratory muscle; attaches to the lower ribs, as well as to the lumbar vertebrae of the spine. When the diaphragm contracts, the dome flattens, moving downward into the abdominal cavity like a piston creating negative pressure (like a syringe barrel)
Term
intercostal muscles (expiratory and inspiratory)
Definition
Intercostal muscle contraction also brings about stiffening of the rib cage during lifting, pushing, and pulling movements, which makes the intercostal muscles an important contributor to these movements.
Term
external and internal obliques
Definition
When these muscles contract, they pull the lower rib margins downward, and they compress the abdominal compartment, raising its internal pressure.
Term
accessory muscles
Definition
scalene, sternomastoid, and trapezium

Scalene is the first muscle to start contracting and gradually other two muscles are brought into action; this muscle contraction is abnormal usually indicating shortness of breath
Term
tidal volume
Definition
the volume of the air that passes in and out of the lungs in an ordinary breath
Term
functional residual capacity
Definition
the amount of air remaining at the end of normal quiet respiration.
Term
minute ventilation
Definition
the total volume of gas in liters exhaled from the lungs per minute
Term
work of breathing
Definition
the effort required to inspire air into the lungs
Term
chemoreceptors
Definition
neural receptors that respond to some local chemical change which influence the respiratory and cardiovascular control centres in the brain stem
Term
phrenic nerve
Definition
one of a pair of nerves that arises from cervical spinal roots and passes down the thorax to innervate the diaphragm and control breathing
Term
bronchodilation
Definition
a widening of the lumen of the bronchi, allowing increased airflow to and from the lungs
Term
intrathoracic pressure
Definition
Pressure within the thoracic cage
Term
oxyhemoglobin dissociation curve
Definition
a graphic expression of the affinity between oxygen and hemoglobin or of the amount of oxygen chemically bound at equilibrium to the hemoglobin in blood as a function of oxygen pressure. The curve also includes the pH, temperature, and carbon dioxide pressure.
Term
gas transport
Definition
Gas exchange between blood and air (external respiration). Gas transport in blood. Gas exchange between the blood and body cells (internal respiration)
Term
humidification
Definition
the process of increasing the relative humidity of the atmosphere around a patient through the use of aerosol generators or steam inhalers that exert an antitussive effect. Humidification acts by decreasing the viscosity of bronchial secretions, whereas added medications or sodium chloride may stimulate coughing by an irritant effect
Term
hering-bruer reflex
Definition
Hering–Breuer reflexes are reactions that produced by the body cells purposely to regulate the rhythmic ventilation of the lungs to prevent over-inflation and overdistention of the lungs.
Term
Blood Gas-PaCO2
Definition
symbol for partial pressure of carbon dioxide in the arterial blood
ABG Normal Value-35 to 45 mmHg
Term
Blood gas- PaO2
Definition
symbol for partial pressure of oxygen in arterial blood
ABG Normal Value-80 to 100 mmHg
Term
Blood gas-pH
Definition
A measure of the acidity or alkalinity of a solution, numerically equal to 7 for neutral solutions, increasing with increasing alkalinity and decreasing with increasing acidity
ABG Normal Value- 7.35 to 7.45
Term
Blood gas-HCO3
Definition
the most important buffer in the blood, it is regulated by the kidney, which excretes it in excess and retains it when needed; it increases with ingestion of excess anti-acids, diuretics and steroids; it is decreased with diarrhoea, liver disease, renal disease and chemical poisoning
ABG Normal Value-22 to 26mEq/L
Term
Blood gas- SpO2
Definition
the saturation level of oxygen in hemoglobin
ABG Normal Values-93 to 100%
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