Download The Respiratory System

The Respiratory
System
 The
Function
main function of the
Respiratory System is to get
oxygen into the bloodstream
and get carbon dioxide out of
the bloodstream. Oxygen is
needed by your body for
respiration (converting glucose
into energy).
The Nose and Mouth
 Air
enters the Respiratory
System primarily through the
nose, but can also enter through
the mouth. Tiny hairs, called
cillia, which filters the air as it
passes through. Mucus also
helps filter and moisten the air.
The Trachea and Bronchi

Air then enters into the trachea,
which is a tube leading from the
mouth to the lungs. The epiglottis
(a flap of tissue at the back of the
throat) closes off the trachea when
you swallow to keep food from
entering. Air flows from the
trachea to the two bronchi, each
leading to one of the two lungs.
The Pharynx and Larynx

The first section
of the trachea is
known as the
pharynx and leads
to the larynx,
which contains
your vocal cords.
Trachea and Bronchi
The Lungs

The bronchi branch off into smaller
and smaller branches called
bronchioles. The bronchioles are
surrounded by the lungs, which are
sack-like organs made of spongy
tissue. They can inflate and
deflate like a balloon.
The Lungs
The Alveoli

At the end of each bronchiole are
tiny air sacs called alveoli. Each
alveolus is surrounded by blood
vessels. Oxygen moves into the
bloodstream, while carbon dioxide
moves from the blood into the
alveoli. The oxygen is carried by
the blood to all parts of your body,
while the carbon dioxide is exhaled
from your body.
The Alveoli
The Diaphragm
 Air
can enter and exit the lungs
by the action of the diaphragm,
which is a long muscle at the
base of the rib cage. When this
muscle contracts (inhaling), air
rushes in because a lower
pressure is created inside your
lungs. When it relaxes, air is
forced out (exhaling).
Breathing
Review!
1. alveoli
A. tiny hairs
2. cilia
B. throat
3. larynx
C. nose
4. nasal cavity
D. windpipe
5. pharynx
E. voice box
6. trachea
F. air sacs
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