Air entering the body is filtered, warmed and humidified by
the upper respiratory tract
helps prevent the alveoli from collapsing
Functions of the nose include
- filtering the air
- warming the air
-humidifying the air
- acting as resonating chamber in speech
The actual sites of gas exchange within the lungs are
Air moves into the lungs because
the gas pressure in the lungs is less than outside pressure
Air moves out of the lungs because
the volume of the lungs decreases with expiration
Expiratory movements are produced by contraction of the
When the diaphragm and external intercostal muscles contract,
the volume of the thoracic cavity increases
Pulmanary ventilation refers to
the movement of air into and out of the lungs
Most of the oxygen transported by the blood is
bound to hemoglobin
Most of the carbon dioxide in the blood is transported as
the most important chemical regulator of respiration is
A 10% increase in the level of carbon dioxide in the blood will
increase the rate of breathing
In quiet breathing
inspiration involves muscular contractions and expiration is passive
If a student inhales as deeply as possible and then blows the air out until he cannot exhale any more, the amount of air that he expelled would be his/her
Which of the following factors would increase the amount of oxygen discharged by hemoglobin to peripheral tissues?
When the diaphragm and external intercoastal muscles contract,
intrapleural pressure decreases
Damage to the surfactant cells of the lungs would result in
Harry suffers from cystic fibrosis and frequently has periods where he can hardly breathe. The problem is probably the result of
thick secretions that exceed the ability of the respiratory tract to remove them
In emphysema, the alveoli break down and coalesce into large air spaces. The lungs also lose elasticity and compliance is increased. You would expect a person who suffers from emphysema to have
-increased dead airspace
-decreased vital capacity
-elevated P(co2) in the blood
-Increased anteroposterior diameter of the thorax
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