Number
of Breaths per Minute
One
Respiration consists of One
Inspiration
One Expiration
Normal
breathing rate is 16 – 18 breaths per minute at rest
During
exercise breathing rate may increase to 70-80 breaths per minute.
Passages
which connect the respiratory surfaces with the outside air.
These
passages are located in
1)The
Nose
2)The
Nasal Cavaties
3)The
Mouth
4)The
Throat
5)The
Trachea
6)The
2 Bronchi
These
passages have a covering of Mucus. This Mucus traps particles from the incoming
air and also moistens it.
The
2 bronchi lead into further passages known as Bronchioles.
This
surface is formed by 300 million air sacs (Alveoli) in each lung.
Total
Respiratory area is 90 square metres
Surfaces
of the Alveoli are moist and form the site of gaseous exchange of oxygen and
Carbon Dioxide. Each Alveolus is surrounded by a capillary network, which
conveys deoxygenated blood to the alveoli and oxygenated blood away from the
alveoli.
STRUCTURES
RESPONSIBLE FOR BREATHING MECHANISM AND VENTILATION OF THE LUNGS
When
air is moved into and out of the air passages and the alveoli there are various
structures which are involved, these are the diaphragm, ribs, intercostal
muscles and pleural membranes.
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