Thryroid glands Flashcards
1
Q
What are some characteristics of the thyroid gland
A
Highly vascular
Little innervation
made of spherical follicles
2
Q
What are the levels of thyroid hormone release
A
More T4 is released than T3
Circulating T4 is higher as well too also
Measure T4
3
Q
Where is most circulating thyroid hormone
A
Bound to blood protein
4
Q
What thryoid hormone is active
A
Free T4 or T3
5
Q
What is thyroxine converted to in the tissue
A
T3
6
Q
What is the biologically active hormone
A
T3
7
Q
What does T3 bind to
A
receptors in the nucleus
8
Q
What does T3 do
A
Increase expression in specific genes
9
Q
What are the effects of thyroid hormone
A
Increase cell resperation Increase O2 use Heat generated Increase cardiac output, muscle activity Growth and development
