Endorine System

In: Philosophy and Psychology

Submitted By maria1135
Words 461
Pages 2
Funció endocrina i nutricional Ferran Rius Riu
Servei d'Endocrinologia i Nutrició
Hospital Universitari Arnau de Vilanova de Lleida frius.lleida.ics@gencat.cat Introducció al sistema endocrí

Concepte d'hormona i secreció hormonal


Regulació de la secreció hormonal


Glàndules i òrgans endocrins
Mecanismes de retroalimentació

Eixos hipotàlem-hipòfisi-glàndula

Sistema endocrí
Conjunt de òrgans amb capacitat de secreció hormonal
! Actua en aspectes bàsics de la fisiologia ! Secreció hormonal molt regulada
! Comú a moltes espècies

Què és una hormona?

Substància que s'allibera al torrent sanguini i té un efecte a distància en un o més òrgans


Poden circular unides a transportadors


S'uneixen a receptors de membrana o nuclears





Derivades d'aminoàcids

Òrgans endocrins

Glàndules endocrines “clàssiques”:


Hipotàlem, hipòfisi, tiroide, paratiroides, suprarenals, gònades

Òrgans i teixits amb capacitats endocrines: −

Fetge, ronyó, pàncrees, sistema digestiu, teixit adipós

La secreció hormonal respon als nivells de la pròpia hormona
! Normalment l'augment d'una hormona inhibeix la seva producció (feed-back negatiu) ! Sovint hi ha efectes també en els sistemes reguladors de la secreció hormonal !

Eixos hormonals



La hipòfisi regula la secreció de bona part de les glàndules endocrines
L'hipotàlem regula la secreció de la hipòfisi
Tot el sistema està regulat per mecanismes de retroalimentació

Principals eixos hormonals

Hipotàlem-hipòfisi-òrgan perifèric:

Tiroide (TRH-TSH-hormones tiroïdals)

Gonades (GnRH-LH i FSH-testosterona, estradiol, progesterona)

Suprarenal (CRH-ACTH-cortisol)

Fetge (GHRH-GH-IGF1)


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It Systems

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