powerpoint presentation on respiration

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 The lungs constitute right lung and the left
lung. These lungs are sectioned in lobes.
 The right lung is larger then left, so it has
more lobes. It has three lobes.
 Left lung has only two lobes and is smaller to
compensate for the space taken by the heart.

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 The alveoli are tiny sacs responsible for gas
exchange.
 These sacs hold air, but they are also
surrounded by capillaries.
 Large surface area to absorb oxygen.
 The capillaries have a tiny wall and are filled
with blood.
 The alveoli supply the blood with the oxygen
that is inhaled.
 Dense network of blood capillaries for easy
exchange of gases.

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 The windpipe branches into two smaller tubes
called the bronchi.
 Bronchioles are structures that branch in
lungs.
 The bronchioles connect on one side at the
trachea and terminate at alveoli.
 The bronchioles carry the air to the alveoli,
where gas exchange occurs.

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 The diaphragm is the muscle responsible for
inflating and expanding the lungs.
 The diaphragm is the strong wall that
separate the chest cavity from the abdominal
cavity.
 When you inhale, the diaphragm muscle
contracts causing the lungs to inflate.
 When you exhale, the diaphragm relaxes and
lungs are returned to their original shape.

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 The lung is a magnificent organ that
performs a multitude of vital functions every
second of our lives.
 Breathing is the most essential of these
functions.
 With each breath, the lungs take in oxygen
and remove carbon di oxide.
 The lungs are also important in the body’s
defense against infection and the harmful
environmental factors.
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