The Respiratory System

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					The Respiratory System
          The Respiratory System
• You breath in and out 15 times
  per minute
• With physical activity breathing
  increases. Why??
• On average the lungs move
  10 000 L of air in and out of the
  lungs each day
• Responsible for providing O2 to
  the cells and removing CO2 from
  the body
• Works in conjunction with the
  circulatory system
             The Respiratory System
Made up of the:

•   Nose (Nasal Cavity)
•   Mouth
•   Trachea
•   Bronchi
•   Lung
    – Bronchioles
    – Alveoli
           The Respiratory System
Air enters through the
 nose and mouth
Passes through the
 pharynx (throat)
Down the trachea
Splits evenly into the 2
Splits into bronchioles
Enters the alveoli
        The Trachea
• The trachea (windpipe) is supported
  by rings of cartilage (connective
   – Gives it a rigid feel
   – Keeps it open
• Splits into two bronchi
                Gas Exchange
• Main purpose of the
  respiratory system
• Each bronchi branches until
  it ends in tiny air sacs
  called alveolus where gas
  exchange occurs
• At the lungs, O2 enters the
  blood stream and CO2
• Each alveolus have very thin
  walls that are surrounded by

• In the alveoli,O2 enters the
  blood stream and CO2 leaves
• The process of moving air
  into (inhalation) and out
  of the lungs (exhalation)
• Involves muscles which
  move the rib cage and a
  large sheet of muscle
  called the diaphragm
• Controlled by the amount
  of CO2 in the blood
                  Other Animals
• Many animals have similar respiratory systems whose
  goal is to make O2 available and rid the body of CO2
• Fish use gills for gas exchange
• The capillaries inside the gills remove the O2 from the
   – That is why some fish need to be continually
     swimming to survive
Diseases of the Respiratory System
• Tuberculosis (TB)
  – Infectious disease (easily passed between people)
  – Causes by bacteria entering your lungs
  – Symptoms include: fever, cough, weight loss,
    tiredness and chest pain
  – Can be fatal if not treated
  – Can be diagnosed with an
   Other Diseases of the Respiratory System

                  severe allergic reaction
  asthma          characterized by the constriction of

                  inflammation of the lining of the
                  bronchioles (branch of bronchi)

                  condition in which the alveoli
emphysema         deteriorate, causing the lungs to
                  lose their gas exchange ability

                  condition in which the alveoli
pneumonia         become filled with fluid, preventing
                  the exchange of gases

                  irregular & uncontrolled growth of
lung cancer
                  tumors in the lung tissue
Respiratory System Structural Review
Connecting the
Respiratory System, the
Circulatory System and
the rest of the body

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