EGANS iTEST iBANK iQUESTIONS iAND iWELL iANALYSIED, iVERIFIED iAND iEXPLAINED iANSWERS iLATEST

EGANS iTEST iBANK iQUESTIONS iAND iWELL iANALYSIED, iVERIFIED iAND iEXPLAINED iANSWERS iLATEST i2025 iDOWNLOAD iINSTA iAFTER iPURCHASING iTHE iDOCUMENT iIN iPDF iFORM i[FROM iCHAPTER i8]

Chapter i08: iThe iRespiratory iSystem

MULTIPLE iCHOICE

• By iwhat imechanism idoes igas iexchange iacross ithe ilung ioccur?
• active itransport
• facilitated idiffusion
• facilitated itransport
• simple idiffusion

ANS: iD

This iclose i“match” iof igas iand iblood iacross ia ilarge ibut iextremely ithin iblood-gas ibarrier imembrane ienables iefficient igas iexchange ito ioccur iby isimple idiffusion.DIF: Application REF: p. i148 OBJ: 1

• What iis ithe iprimary ipurpose iof ithe irespiratory isystem?
• continuous iabsorption iof ioxygen iand iexcretion iof icarbon idioxide
• filtering ito iprevent iallergens iand imicrobes ifrom ireaching ithe ilungs
• transport ioxygenated iblood ito ithe itissues
• warm iand ihumidify iinspired igas

ANS: iA

The irespiratory isystem's iprimary ifunction iis ithe icontinuous iabsorption iof ioxygen iand ithe iexcretion iof icarbon idioxide.

DIF: Application REF: p. i148 OBJ: 1

• What iis imeant iby i“internal irespiration”? 1 / 4

• any igas iexchange ithat ioccurs iinside ithe ibody
• consumption iof ioxygen iin ithe imitochondria
• continuous iabsorption iof ioxygen iand iexcretion iof icarbon idioxide
• exchange iof igases ibetween ithe iblood iand ithe itissue

ANS: iD

This iprocess isupports iinternal irespiration, iwhich iis ithe iexchange iof igases ibetween iblood iand itissues.

DIF: Application REF: p. i148 OBJ: 1

• Developmental imorphogenesis iof ithe ihuman irespiratory isystem ican ibe icategorized iinto:
• three iperiods
• five istages
• 6 iweeks
• 40 iweeks 2 / 4

ANS: iB

Figure i8-1 ishows ithe ivarious istages iof ilung idevelopment, iand iTable i8-1 isummarizes ithe imajor idevelopmental ievents iin ieach iphase.

DIF: Application REF: p. i149 OBJ: 1

• The ihuman igenome icontains pairs iof ichromosomes.
• 16
• 23
• 46
• 50

ANS: iB

DNA iis iorganized iinto i23 ipairs iof isupercoiled imasses ithat iare icalled ichromosomes.iDIF: Recall REF: p. i150 OBJ: 2

• Which ichromosome ihas ibeen ifound ito icarry ithe idefective igene iresponsible ifor

ithe idevelopment iof icystic ifibrosis?

• 1
• 7
• 15
• 23

ANS: iB

The idefective igene ithat iis iresponsible ifor idefective iCFTR iis ilocated ion ichromosome i7 iin ithe iq31.2 iregion iand ihas ibeen ifound ito ibe imutable iin imore ithan i1500 idifferent iways.DIF: Recall REF: p. i191 OBJ: 2

• The ifetus iis ipotentially iviable iif iborn iprematurely iafter ihow imany iweeks iof igestation?
• 12 ito i16 iweeks
• 18 ito i20 iweeks
• 24 ito i26 iweeks
• 28 ito i32 iweeks

iANS: iC 3 / 4

At ithe iend iof ithe icanalicular iperiod i(24 ito i26 iweeks iof igestation), ithe ifetus, iif iborn, iis icapable iof isufficient igas iexchange iand iis iviable iif isupported icompletely iwith ian iartificial iairway, ioxygen, iventilatory isupport, iand isurfactant iadministration.DIF: Application REF: p. i149 OBJ: 1

• The ifetus iis ipotentially iviable iif iborn iat ithe iend iof iwhich istage iof idevelopment?
• alveolar
• canalicular
• pseudoglandular
• saccular

ANS: iB

At ithe iend iof ithe icanalicular iperiod i(24 ito i26 iweeks iof igestation), ithe ifetus, iif iborn, iis icapable iof isufficient igas iexchange iand iis iviable iif isupported icompletely iwith ian iartificial iairway, ioxygen, iventilatory isupport, iand isurfactant iadministration.

DIF: Application REF: p. i149 OBJ: 1

• During iwhich iphase iof ifetal idevelopment ido imature ialveoli iappear?
• alveolar
• canalicular
• pseudoglandular
• saccular

ANS: iA

The idevelopment iof imature ialveoli, iaccompanied iby icapillary iproliferation iwithin ithe iwalls, imarks ithe ifinal iphase iof ilung idevelopment iand iis iknown ias ithe ialveolar iperiod.DIF: Application REF: p. i149 OBJ: 1

• Which iof ithe ifollowing iis ian iindex icommonly iused ito idetermine irelative ilung imaturity?
• FRC/TLC iratio

b. L:S iratio

• RQ iratio
• SP-A

ANS: iB

Quantification iof ithese iphospholipids i(the iL:S iratio iand iPG iconcentration) iprovides ia ipredictive iindex iof ithe ilung imaturity iin ithe ifetus ibefore ibirth iand ithe irisks iof ideveloping irespiratory idisease.

DIF: Application REF: p. i153 OBJ: 1

• / 4