Download Respiratory System Powerpoint

Function of the Respiratory System
Respiration = Exchange of gases in
the lungs
Inhalation of Oxygen
Exhalation of Carbon Dioxide
Breathing Process
 The breathing process is controlled by the actions of
muscles in your ribs and chest.
Inhalation – When you inhale, or breathe in, rib
muscles pull the ribs up and out. At the same time the
diaphragm muscle flattens. The chest cavity enlarges,
the volume of the lungs increases and air flows in.
Exhalation – When you exhale, or breath out, the
diaphragm moves upward. The rib muscles relax and
the ribs drop. The chest cavity gets smaller and
squeezes air from the lungs.
Gas Exchange:
 Oxygen is inhaled into lungs.
 Passes over the capillaries in the lungs
where red blood cells pick up the
oxygen.
 Carbon Dioxide passes from the blood
cells ready to be exhaled.
 Inhaled oxygen goes back to the heart
Parts of the respiratory system:
 Nose – Cartilage and bone covered in skin.
 Nostrils – one location air enters.
 Nasal Cavity – lined with cilia to help filter foreign
debris out.
 Larynx – Voice box (vibrates when air passes through
which makes sound).
 Trachea – known as the windpipe and serves as a
passage way to the bronchi.
 Bronchi – Two tubes the trachea branches into.
 Lungs – Primary organs of the respiratory system
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The path of air through the lungs
 Air moves into the lungs through the bronchi
 In the lungs, the bronchi branch out into smaller and
smaller tubes
 Then the air finally moves into sacs at the ends of the
bronchioles, which are called alveoli
 Alveoli is where the gas exchange occurs in the lungs.
Keeping Your Respiratory System
Healthy
 Avoid smoking and air pollution – smoking and air
pollution can lead to serious respiratory disorders.
 Wear a mask when working with fumes or dust and work in
a well ventilated area. Check air quality before exercising
outdoors.
 Avoid respiratory infections – infections can cause the
bronchi to become inflamed which causes the membranes
to secrete a lot of mucus in your lungs.
 Get regular exercise – exercise helps your lungs become
more efficient at taking in oxygen and eliminating CO2.
 Maintain a healthy weight – if you are overweight your
respiratory system has to work harder to get enough oxygen
to your muscles and organs.
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