General InfoGeneral Info

Delivers O2 to the body; disposes of CO2Delivers O2 to the body; disposes of CO2Works with circulatory systemWorks with circulatory systemThoracic cavity: surrounded by ribs andThoracic cavity: surrounded by ribs anddiaphragmdiaphragm

NoseNoseExternal naresExternal nares (nostrils) - Lined with (nostrils) - Lined with mucus on a mucus on a superficialsuperficial network of veins network of veinsNasal cavity: interior of noseNasal cavity: interior of nose Surrounded by Surrounded by paranasal sinusesparanasal sinuses: lighten skull, lighten skull,

resonance chambers for speech, produce mucus. resonance chambers for speech, produce mucus. Infection of the nose can spread to the sinuses = Infection of the nose can spread to the sinuses = sinusitis (blocked passageways between nasal cavity sinusitis (blocked passageways between nasal cavity and sinus = partial vacuum and causes a sinus and sinus = partial vacuum and causes a sinus headache)headache)

Cilia create a gentle current that moves Cilia create a gentle current that moves contaminated mucus down the throat contaminated mucus down the throat where it is swallowed and digested by the where it is swallowed and digested by the stomachstomach

Cold weather slows ciliaCold weather slows cilia

Pharynx (throat)Pharynx (throat)Passageway for food Passageway for food ANDAND air air

muscularmuscularPharyngeal

tonsils

Auditory tubes drain ear here which is why Auditory tubes drain ear here which is why an ear infection sometimes follows a sore an ear infection sometimes follows a sore throat.throat.

Pharyngeal tonsils get swollen and block Pharyngeal tonsils get swollen and block nasopharynx and person breathes through nasopharynx and person breathes through mouth mouth mouth breathing is not properly mouth breathing is not properly moistened, warmed or filteredmoistened, warmed or filtered

Larynx (voicebox)Larynx (voicebox)cartilagecartilage

Contains vocal cords Contains vocal cords – vibrate when air – vibrate when air passes overpasses over

Epiglottis -Epiglottis -tilts when tilts when swallowing, blocking the swallowing, blocking the opening of the larynx opening of the larynx

Trachea Trachea Lined with ciliated mucosa – cilia Lined with ciliated mucosa – cilia moves foreign material AWAY from moves foreign material AWAY from the lungs. the lungs.

Smoking destroys ciliaSmoking destroys cilia

Primary bronchiPrimary bronchiDivision of Division of tracheatrachea

LungsLungsLeft = 2 lobes; right = 3Left = 2 lobes; right = 3 lobeslobes

Bronchi subdivide into secondary, Bronchi subdivide into secondary, tertiary bronchitertiary bronchi

Ends with bronchiolesEnds with bronchioles

Lead into Lead into alveolialveoli (air sacs) (air sacs) place place of gas exchangeof gas exchange

enlarged

SUMMARYSUMMARYThoracic cavity surrounded by rib cage Thoracic cavity surrounded by rib cage and diaphragmand diaphragm

Pulmonary arteries (2) go to the lungs to Pulmonary arteries (2) go to the lungs to unload CO2unload CO2

Pulmonary veins (4) bring oxygenated Pulmonary veins (4) bring oxygenated blood back to heartblood back to heart

Ciliated cells line respiratory track. Ciliated cells line respiratory track. WHY?WHY?

Mucus lines respiratory track. Mucus lines respiratory track. WHY?WHY?

Most organs of respiratory track are Most organs of respiratory track are passageways for air. passageways for air. WHAT’S THE WHAT’S THE EXCEPTION?EXCEPTION?

A smoker’s lungs

Pulmonary (or visceral) pleura: surrounds Pulmonary (or visceral) pleura: surrounds each lung.each lung.

Parietal pleura line the thoracic cavityParietal pleura line the thoracic cavity These membranes produce pleural fluidThese membranes produce pleural fluid

PleuraPleura