Kapitel 7 Flashcards

1
Q

Adenosine

A

Dannes ud fra AMP, ved hypoksisk tilstande, og forøger oxygen forbrug, som leder til ATP hydrolyse.

Er en vigtig vasodilator.

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2
Q

Inorganisk fosfat

A

Mindre vasodilatorisk betydning

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3
Q

CO2

A

Forårsager vasodilation

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4
Q

Hydrogen ioner

A

Vasodilation

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5
Q

Kalium

A

Vasodilation

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6
Q

Oxygen

A

Mangel forårsager vasodilation

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7
Q

Osmolaritet

A

Høj osmolaritet forårsager vasodilation

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8
Q

Histamin

A

Vasodilation og forøget kapillær permabilitet.

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9
Q

Bradykinin

A

Vasodilation

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10
Q

NO (Nitric oxide)

A

Dannes af NOS enzym.
Virker som vasodilator.

Øget shearing force (blod flow) øger NO dannelse.
Dannes fra endothel celler i blodkar

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11
Q

Prostacyclin

A

Dannes fra endothel celler i blodkar.
Kraftig vasodilator.
Inhiber samling af blodplader.

Adenosine og NO stimulerer en større dannelse af prostacyclin

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12
Q

Endothelin-1

A

Dannes fra endothel.
Kraftig Vasokonstriktor

Dets dannelse er stimuleret af angiotensin II, vasopressin, thrombin, cytokiner, og shearing force.

Dets dannelse er inhiberet af NO og prostacyclin, samt ANP.

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13
Q

Stigning og fald i volumen i blodkar, ifht myogent respons

A

Trykstigning i blodkar –> Konstriktion i kar

Trykfald i blodkar –> relaxation i kar.

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14
Q

Autoregulation af flow

A

Hvis perfusionstryk falder, så vil organer som regel have et lokalt respons, der sænker modstand i området, så blod flowet bliver normalt igen.

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15
Q

Hyperemia

A

Forøgelse af blod flow til et område, som et resultat af øgelse af metabolisk aktivitet (eller akkumulation af metabolitter).

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