Transcript Contracts and relaxes helping to force air into and out of the lungs

Respiratory System
Respiratory Tract Organs
Diaphragm- a muscular wall that divides
the chest (pleural) cavity from the
abdominal (peritoneal) cavity. Contracts
and relaxes helping to force air into and
out of the lungs.
Larynx- Voice box of the pig. Allows the
pig to “oink” 
Lungs- Allows oxygen to diffuse into the
bloodstream as carbon dioxide is being
released from the bloodstream.
Trachea- Carries air between the lungs
and the throat.
Respiratory System
The respiratory system bring in oxygen and
expels carbon dioxide.
At the top of the respiratory system, the
nostrils (also called nares) act as the air
intake, bringing air into the nose, where it's
warmed and humidified.
Tiny hairs called cilia line the nasal
passageway & filter out dust and other
particles that enter the nose through the
breathed air.
Respiratory System
Air can also be taken in through the
mouth. These two openings of the
airway (the nasal cavity and the
mouth) meet at the pharynx, or throat,
at the back of the nose and mouth.
The pharynx is part of the digestive
system as well as the respiratory
system because it carries both food
and air.
How is choking prevented?
At the bottom of the pharynx, this
pathway divides in two, one for food
(the esophagus, which leads to the
stomach) and the other for air.
The epiglottis, a small flap of tissue,
covers the air-only passage when you
swallow, keeping food and liquid from
going into the lungs.
Larynx (voice box)
The larynx, or voice box, is the
uppermost part of the air-only pipe.
This short tube contains a pair of
vocal cords, which vibrate to make
sounds
Larynx
Trachea
The trachea, or windpipe, extends
downward from the base of the
larynx.
The walls of the trachea are
strengthened by rings of cartilage to
keep it open.
The trachea is also lined with cilia,
which sweep fluids and foreign
particles out of the airway so that they
stay out of the lungs.
Trachea
Lungs
Contraction of the diaphragm enlarges the
thoracic cavity and pulls air into the lungs
At its bottom end, the trachea divides into
left and right air tubes called bronchi,
which connect to the lungs.
Within the lungs, the bronchi branch into
smaller tubes called bronchioles.
Bronchioles end in tiny air sacs called
alveoli, where the exchange of oxygen and
carbon dioxide actually takes place.
Respiratory System of Pig
Respiratory System of Pig