Download The Respiratory System

The Respiratory System
What is the Respiratory System?
 Your respiratory system is made up of the
organs in your body that help you to breathe.
 Remember that Respiration = Breathing
 The goal of breathing is to deliver oxygen
(inhale) to the body and to take away
carbon dioxide (exhale)
Mouth & Nose
 Air enters the body through either the open
mouth or the nose.
 It travels down the trachea to the lungs,
where the oxygen in it passes into the
bloodstream.
 Tiny hairs in the nose trap unwanted particles
while a sticky liquid called mucus catches
many of the germs before they all can go too
far into the respiratory system. The mucus
also warms and moistens the air.
Epiglottis
 A flap of skin in the
throat that blocks the
windpipe when food or
liquid is being
swallowed.
 This prevents food from
going down the wrong
pipe.
Larynx
 The part of the respiratory system that
contains your vocal cords.
 It is commonly called the voice box.
 The larynx is the place where moving air
being breathed in and out creates voice
sounds.
Trachea
 The trachea is a 4 ½
inch long tube.
 It is sometimes called
the windpipe.
 The trachea filters the
air we breathe and
branches into the
bronchi tubes.
Bronchi Tubes
 The bronchi are two air tubes that branch off
of the trachea and carry air directly into the
lungs.
 One bronchi tube goes to the left lung, and
one bronchi tube goes to the right lung.
 Each bronchi tube divides off into smaller
tubes called bronchioles.
Alveoli
 Bronchioles eventually lead to tiny, stretchy
sacs called alveoli.
 These air sacs blow up like tiny balloons
when you breathe in.
 Oxygen from the air passes through the walls
of the alveoli while carbon dioxide is passed
out.
Alveoli
Lungs
 The lungs are the main
organs of the
respiratory system.
 In the lungs oxygen is
taken into the body and
carbon dioxide is
breathed out.
Lungs
 The red blood cells are responsible for picking up the
oxygen in the lungs and carrying the oxygen to all the
body cells that need it.
 The red blood cells drop off the oxygen to the body
cells, then pick up the carbon dioxide which is a
waste gas product produced by our cells.
 The red blood cells transport the carbon dioxide back
to the lungs and we breathe it out when we exhale.
Lung Defenses

Cilia: waving hair-like
projections lining the
respiratory tract that
help to trap/catch
bacteria.

Mucus: sticky liquid
that traps debris and
germs in order to help
get rid of it.
Alveoli
Video Clip
 BrainPOP- Respiratory System