Circadian Rhythms, adrenal insufficiency and management Flashcards
1
Q
Describe the HPA axis
A
2
Q
A
2
Q
High T3 and T4 causes what (HPA axis)
A
Low TRH and low TSH as a response
3
Q
Low T3 nd T4 causes what as a response (HPA axis)
A
high TRH and high TSH
4
Q
What are the functional units of the thyroid
A
follicles
5
Q
what do parafolicuar cells (C cells) in the thyroid secrete
A
calcitonin
6
Q
In the HPA axis when TSH binds to TSH receptors on colloid cells in the thyroid, what does this release and what ion channel does it stimulate
A
- Thyroglobulin and ion channels for iodine to be relseased into the cells.
- Thyroglobulin + Iodine —> T4 and T3 (odixadtion reaction)
7
Q
A
