Transcript Introduction-to-The-Respiratory

Introduction to the Respiratory
System
Review of the Structures Involved in
Breathing
Week 3
Lets start by reviewing the
anatomical structures of the
respiratory system
Can anyone name any of the
structures involved in
breathing?
Now we’ve got a list can you put them in order?
Overview of the Structures of the Respiratory
System
The air continues into many
branching airways known as
the bronchial tree
The trachea and
bronchi have
supporting cartilage to
keep the airways open
Bronchiole walls
contain more
smooth muscle.
The air is moistened,
warmed and filtered
as it flows through
these passageways
The airways from the
nasal cavity through the
terminal bronchioles are
called the conducting
zone
The air then reaches
the respiratory zone
The respiratory zone
The respiratory zone
contains alveoli, tiny
thin walled sacs
where gas exchanges
occurs.
Terminal
bronchi
Alveoli
Lets now look at the
actual site of diffusion,
the respiratory
membrane
The structure of the respiratory
membrane
Is composed of.
The alveolar wall,

The capillary wall,
and,

Their basement
membranes.

It
is very thin, measuring
only 0.5 to 4.0 Цm.
This
membrane presents a
barrier for gas exchange.
Summary
• The respiratory system consists of the
nose, pharynx, larynx, trachea, bronchi and
lungs.
• The lungs contain the bronchial tree, the
branching airways from the primary
bronchi through the terminal bronchioles.
• The respiratory zone of the lungs is the
region containing alveoli, tiny thin-walled
sacs where gas exchange occurs.
• Oxygen and carbon dioxide diffuse
between the alveoli and the pulmonary
capillaries across the very thin respiratory
membrane.