Download The respiratory System

The Gas Exchange System
 http://www.youtube.com/watch?feature=pl
ayer_embedded&v=3nZaSrV6v6k#
 Consists of: lungs,
diaphragm, trachea,
larynx and pharynx
 Primary function:
bringing oxygen into the
body and help remove
waste gases from the body
 Inhalation
(inhale): contraction of
diaphragm causes lungs to increase in size
which creates a vacuum so air is pushed into
the lungs.
 Exhalation (exhale): diaphragm relaxes
which causes the lungs to decrease in size and
increase in pressure which pushes the air out
of the lungs
 When active, respiration increases to bring
more oxygen into the body. When resting,
respiration will decrease since less oxygen in
required by the body.
Nostrils(mouth) → pharynx → larynx → trachea
→ bronchi → bronchioles → alveoli
http://www.youtube.com/watch?v=HiT621PrrO0&feature=related
Nasal Cavity – air is warmed and moistened
Pharynx – connects the nasal and oral cavities
with the esophagus and trachea
Larynx – located at the top of the trachea, this is
where the vocal chords (voice box) is located
Epiglottis – thin flap on top of the trachea that
keeps food and water from entering the trachea.
Trachea – tube with rings of cartilage (can be
felt in front of neck) that transport air between
the larynx and bronchi.
Bronchi – large tubes that connect the trachea to
the bronchioles
Bronchioles – smaller tubes that branch off and
connect the bronchi with the alveoli
Alveoli – tiny sacs in the lungs that are
surrounded by capillaries where air exchange
occurs between the lungs and blood. Oxygen
diffuses into the blood and waste gases such as
carbon dioxide diffuse into the alveoli to be
exhaled.