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Respiratory System
Take a deep breath
and relax
Respiration:
The exchange of
oxygen from
environment for
carbon dioxide from
the body’s cells.
Structure
Pharynx
Larynx
Trachea
Nose
Mouth
Lungs
Epiglottis
Bronchi
Bronchioles
Alveoli
Diaphragm
• Nose- lined with mucous membranes. Air is
warmed, filter and moistened
• Pharynx or throat- Carries food and air.
Esophagus branches off here
• Larynx or voice box- Short tube contains
vocal cords. Uppermost part of air only
passage.
• Trachea or windpipe-extends from base of
larynx to lungs. Lined with cilia.
• Epiglottis- tiny flap that covers opening to
trachea during swallowing keeping food and
liquid from going into our lungs.
• Bronchi - left and right
air tubes that extend
into the lungs.
• Bronchioles- smaller
branches of the
bronchi which are as
thin as a strand of hair.
Bronchioles end in small
air sacs called alveoli.
We have 100’s of millions
of alveoli in our lungs.
Alveoli are surrounded
by capillaries that are
filled with blood.
Gas exchange takes place in the alveoli.
What gases are exchanged?
Diffusion: Oxygen moves from alveoli to the blood through
the capillaries. Blood flows to the heart, through arteries to
tissues. Carbon dioxide produced during diffusion returns to
heart through the veins and back to lungs where it’s passed
to Alveoli to be exhaled.
• Muscles used in
breathing –
Diaphragm,
intercostal muscles,
throat and neck
muscles.
• When we breathe in
Diaphragm moves?
• When we breathe
out Diaphragm
moves?