Thyroid Physiology Flashcards Preview

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Flashcards in Thyroid Physiology Deck (13)
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1

List the main thyroid hormones

Thyroxine (T4)
Triiodothyronine (T3)
Calcitonin

2

What chemical is the main "fuel source" of the thyroid?

Iodine

3

What happens to iodine once it is taken up by the follicle cells of the thyroid?

Combines with tyrosine residues on thyroglobulin to form MIT or DIT

4

Outline the composition of T3

MIT + DIT

5

Outline the composition of T4

DIT + DIT

6

T3 is the more abundant thyroid hormone. True/False?

False
T4 makes up 90% of thyroid hormones

7

Is T3 or T4 more biologically active?

T3

8

T4 is converted to T3 by liver/kidney. True/False?

True

9

The unbound form of thyroid hormone is biologically inactive. True/False?

False
Unbound is active!

10

What are the 2 main types of cell found in the thyroid?

Follicular cells
Parafollicular C cells

11

What is stored in the colloid of the thyroid?

Thyroglobulin

12

What do follicular cells secrete?

Thyroglobulin

13

T3 and T4 are hydrophobic. True/False?

True