Absorbtia Flashcards

1
Q

Monozaharidele sunt absorbite prin:

A
  • transport activ secundar

- difuziune facilitata

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2
Q

Glucoza si galactoza se absorb printr-un mecanism:

A

in competitie, simport cu Na

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3
Q

Ce fac glucidele nedigerabile?

A
  • cresc volumul mat fecale

- influenteaza peristaltica intestinala

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4
Q

Proteinele sunt absorbite prin:

A

transport activ secundar sub forma de Aa esentiali

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5
Q

Acizii grasi esentiali pentru dezvoltarea fatului sunt:

A

eicosapentanoic si docosahexanoic (vedere)

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6
Q

90% din lipidele ingerate sunt:

A

TG

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7
Q

Lipsa sarurilor biliare/ lipazei pancreatice dă:

A

steatoree = eliminarea unor cantitati crescute de lipide in materiile fecale

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8
Q

Cantitatea de Na care se pierde prin fecale:

A

0,5%

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9
Q

Na se absoarbe:

A
pasiv prin:
- antiport Na/H
- simport Na/glucoza sau Na/Aa
- canale de Na in cant mica
in jejun
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10
Q

K se absoarbe:

A

pasiv prin spatiile intercelulare in intest subtire

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11
Q

Cresterea K duce la:

A

aritmii cardiace

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12
Q

Scaderea K duce la:

A

fasciculatii musculare dureroase

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13
Q

Cl se absoarbe:

A
  • in jejun: pasiv prin spatiile intercelulare

- in ileon: preluat de enterocit la schimb cu bicarbonatul

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14
Q

Bicarbonatul se absoarbe:

A

in jejun impreuna cu Na

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15
Q

Zn intra in componenta:

A

unor enzime: anhidraza carbonica si fosfataza alcalina

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16
Q

Zn este absorbit:

A

jumatate activ in ileon => stocat sau eliberat in circulatie

17
Q

Mg este absorbit:

A

pasiv in intest subtire

18
Q

Fe este absorbit:

A
  • in duoden + jejun sup

- la nivelul marginii in perie unde exista un transportor activ

19
Q

Apa se absoarbe:

A

prin difuziune simpla dependenta de osmolaritatea continutului luminal si de locul absorbtiei

20
Q

Absorbtia apei se face diferit la diferite nivele:

A
  • duoden + jejun: 4 L/zi
  • ileon: 3 L/zi
  • colon: 1,5 L/zi
21
Q

Vit C se absoarbe:

A

activ in ileon

22
Q

Vit B2/ Riboflavina se absoarbe:

A

activ, saturabil, in port proximala a intest subtire

23
Q

Vit B1/ Tiamina se absoarbe:

A

in jejun in fct de concentratia sa:

  • scazuta: activ
  • crescuta: pasiv
24
Q

Vit PP/ Niacina se absoarbe:

A

diferit in fct de concentratia ei:

  • scazuta: transport facilitat dependent de Na
  • crescuta: difuziune simpla
25
Q

Vit B6/ Piridoxina se absoarbe:

A

prin difuziune simpla

26
Q

Vit B7/ Biotina se absoarbe:

A

in fct de concentratia sa:

  • scazuta: activ dependent de Na
  • crescuta: difuziune simpla
27
Q

Acidul folic se absoarbe:

A

cu ajutorul unor enzime, la marginea in perie a enterocitului

28
Q

Vit B12 se absoarbe:

A

dependent de factorul intrinsec Castle