Download The Respiratory System

Ms. Kelly
7th Grade Health
Primary Function
 To supply the blood with oxygen in order for
the blood to deliver oxygen to all parts of the
body. (This is done through breathing.)
Breathing In and Out
 Inspiration: “Breathing in” or inhaling
 Expiration: “Breathing out” or exhaling
 Oxygen: what we breathe in during inspiration
 All of the cells in our body need this to live
 It is the fuel that makes all body processes run
 Carbon dioxide: what we breathe out during
expiration
 The waste product in our bodies
Parts of the Body Involved
 Nose
 Throat
 Voice box
 Windpipe
 Lungs
Nose
 Organ used during inhalation and exhalation
 Cilia helps trap and filter out dust and other
particles that enter during inspiration
Mouth
 With nose, warms and humidifies air entering
the lungs through inspiration.
Pharynx
 AKA “The Throat “
 Carries both food and air
Esophagus
 Passageway for food
Epiglottis
 A small flap of tissue that covers the air
passage when we swallow
 Keeps food and liquid from going into lungs
Larynx
 AKA “The Voice Box”
 Uppermost part of
the air-only passage
 Contains vocal cords,
which vibrate to
produce sound
Trachea
 AKA “The Windpipe”
 Extends downward from base of
larynx
 Held open by “C” rings of cartilage
for easy air-flow
Bronchi
 Branches off of the trachea into the lungs
Bronchioles
 Smaller branches off of the bronchi
 Contain alveoli (air sacs)
Alveoli
 Where the exchange of oxygen and carbon
dioxide actually takes place
 Each lung houses about 300 to 400 million
alveoli!!
Diaphragm
 Muscle that separates chest from abdomen
 Helps regulate breathing by moving up and
down
When we breathe IN
 Diaphragm moves downward toward the
abdomen
 Rib muscles pull the ribs upward and outward,
enlarging the chest cavity and pulling air in
through the nose or mouth
When we breathe OUT
 Diaphragm moves upward
 Chest cavity to get smaller and pushes the gases in
the lungs up and out of the nose and mouth.
Ribs
 Protect the lungs and much of the respiratory
tract
Pathway of Oxygen
nose
mouth
pharynx
larynx
lung
R. bronchus
trachea
L. bronchus
bronchiole
diaphragm
alveoli