The Thyroid Gland Flashcards

1
Q

Hvad transporterer iodid BL

A

NIS (drevet af Na gradient)

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2
Q

Hvad transporterer iodid apikalt

A

pendrin

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3
Q

Hvad oxiderer iodid

A

thyroid peroxidase

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4
Q

Hvilke plasma proteiner binder T3 og T4

A

TBG, TTR og albumin

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5
Q

Hypothyroidisme

A

lavt niveau af iodid

Øget TSH, trophisk effekt

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6
Q

Hvad omdanner T4 til T3 eller rT3

A

5´/3´ monodeionase eller 5/3-monodeionase

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7
Q

Hvor sidder monodeionaserne

A

på indersiden af cellemembranen i target vævet

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8
Q

Hvad binder T3 til

A

TR-RXR kompleks

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9
Q

Hvad gør thyroid hormoner

A

øger basal metabolic rate (BMR)
øget gluconeogenese, glycogenolyse, protein syntese, protein proteilyse, lipolyse, varme, øget beta adrenoceptor (sensitivitet for catecholaminer)

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10
Q

Hypothalamic-throid axe

A

TRH (fra small body neurons i hypofysen) binder TRH receptor i hypothalamus. Gn. GPCR aktiveres PLC => IP3 og DAG => øget Ca og PKC => frigivelse af TSH
TSH => AC => mange ting

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11
Q

Negativ feedback + andre hæmmere

A

T3 og T4 hæmmer TRH og TSH

Dopamin og somatostatin hæmmer TSH

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12
Q

Graves

A

Hyperthyroidisme => øget BMR

Autoimmun sygdom hvor B lymphocytter frigiver et stof som binder TSH receptoren (ingen NF)

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13
Q

Hashimoto

A

Autoimmun sygdon => antistoffer mod TSH receptor => inhibering af receptoren => hypothyroidism

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14
Q

dannelse af T3 og T4

A
  1. optage BL gn. NIS drevet af Na
  2. Pendrin transporterer iodid apikalt og thyroglobulin exocyteres
  3. Iodid oxideres af thyroid peroxidase
  4. Thyroglobolin iodineres
  5. Konjugereing
  6. endocytose
  7. Proteolyse => T3,T4, DIT og MIT
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