RATI
ON
THEMECHANI
SMSOFRESPI
RATI
ON
Itconsistsoft
wophases.Theseactionsareaccompli
shed
byalt
ernateincr
easeanddecreaseofthecapacit
yofthethor
aci
c
cav
ity.Theratevar
iesbet
ween16- 20mins,andisfast
eri
n
chi
l
drenandsl owerinel
derl
y.
MOVEMENTSOFRESPI
RATI
ON
Thet hr
eethoraci
cdimensionsar
ethever
ti
cal
,ant
eropost
eri
or,
andtransver
sediameter.Ther
earetwoty
pesofi
nspir
ati
on;qui
et
andforcedinspi
rati
on.
MOVEMENTSOFTHETHORACI
CWALLDURI
NGQUI
ET
I
NSPI
RATION
Verticaldi amet er:Itiscont r
olledbyt hediaphragm.Contr
acti
on
andr elaxat i
onoft hedi aphragm lengthensandshor tenst
he
thoraciccav ity.Ther oofoft hethoraciccageisf or
medbyt he
suprapl euralmembr ane( fi
xed).Whi l
e,thefl
oorisformedbythe
mobi ledi aphragm.Cont ract
ionoft hediaphragm pull
sthecentr
al
tendoni nfer
iorly.
Ant
eropost
eri
ordi
amet
er:I
tisi
ncr
easedwhent
hei
nter
coast
al
muscl
escontr
act.
PUMP-
HANDMOVEMENT
Movementoftheri
bs(2nd-6t
h)atthecost
over
tebralj
oints
aroundanaxispassi
ngthroughthenecksofther
ibselevatesthe
anteri
orendsofther
ibs.Thei
relev
ati
onalsowouldresul
tint he