These increased diameters enlarge the volume of the
c
y.
Thus, the pressure of the air inside (decreases) (increases). The pressure difference
forces air into the
y passages and into the a
i of the lungs.
12.
Costal exhalation is essentially the reverse of
l
n. The rib cage
moves
ward as a whole. There is a decrease in the
se and __-__
creases the pressure inside so that it is (greater) (less) than the
pressure outside.
13.
The abdominopelvic cavity is enclosed by essentially
r barriers.
The thoracic diaphragm is attached to the inferior margin of the ___ __ _
and to the bodies of the lumbar
e behind. It domes upward into the
cavity. As the diaphragm contracts, it moves
ward and produces a
piston-like pressure on the contents of the a
c cavity.
14.
As the thoracic diaphragm contracts and lowers, the vertical
r of the
thoracic cavity increases. This increases the volume of the
cavity. Thus, the
pressure of the air in the lungs (increases)(decreases). Thus, air moves (into) (out of)
the lungs.
The walls of the abdominopelvic cavity are
d by the added pressure.
As this happens, the walls store
energy.
15.
When the thoracic diaphragm relaxes, the potential energy stored in the
stretched muscular walls becomes
energy, and the walls rebound. During
forced breathing, the walls
t for the amount of air to be pushed out.
When the abdominal walls rebound or contract, pressure is transferred to the
underside of the
c
m. The relaxed thoracic diaphragm is thus pushed
up into the t
c
. This decreases the v
ld
r and v
e
of the thoracic cavity. This results in
creased pressure within the lungs, and air is
forced (out) (in) through the respiratory passageways.
16.
The general functions of the supralaryngeal structures are to condition the
inflowing air and to
t it. Conditioning includes cl
ing, w
ing, and
m
ing.
17.
The nares are guarded by stiff nasal
s, which serve to remove (larger)
(smaller) particles from the inflowing air.
MD0007
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