| Mechanism
of Thyroid Control |
| Negative feedback |
| TRH |
| TSH |
|
|
|
|
|
| Thyroid |
||||
| follicular |
||||
| cells |
||||
|
|
|
| T4 |
||
| & T3 |
||
| Hypothalamus |
| +
stimulus |
| Target
cell |
|
|
| h energy demanding |
|
| activities |
|
| h BMR |
|
|
|
|
|
| Diffuse |
||||
| into target |
||||
| cells |
||||
|
|
| T4 àT3 |
|
| inside
target |
|