TG
SECRETION OF THYROID HORMONE
IODINATION OF THYROGLOBULIN BY
THYROID PEROXIDASE
�DIFFUSION�
OF THYROXINE THROUGH
CELL MEMBRANE
DEGRADATION
OF
THYROGLOBULIN
FUSION
OF PHAGOSOME WITH
LYSOSOMES
ENDOCYTOSIS
OF �COLLOID�
IN FOLLICLE BY PSEUDOPOD
TG
TG
TG
T4
T3
>
>
>
I
IODIDE
UPTAKE
BY
Na/I
SYMPORTER
IODIDE
IN ECF~20nM
DEGRADATION
AND
RECYCLING
OF
MIT/DIT
BY
DEIODINASES
FREE
THYROXINE RELEASED FROM PROTEIN INTO CYTOPLASM
TG
2
1
3
4
5
6
7
8
Additional metabolism??