Thyroid - Smith Flashcards
Which hormone ONLY inhibitis the Hypothalamus
TSH
Which hormone inhibits both Hypothalamus and Anterior Pituitary
Thyroid hormones
What hormone does the Hypothalamus release to stimulate the anterior pituitary
TRH (THyroid releasing hormone)
Is thyroglobulin found in an inactive or active Thyroid gland
Inactive
What do the follicular cells secrete
Thyroxine (T4)
Triiodothyronine (T3)
What is the main difference between T4 and T3
T4 - produced solely by Thyroid gland
T3 - Produced by thyroid via deiodination of T4
The Parafollicular cells secrete….
Calcitonin (released in response to High blood calcium)
What hormone is released in response to LOW blood Calcium
Parathyroid Hormone (PTH)
secreted by chief cells
What is the acitve and inactive form of the thyroid hormone
T3 -(active)
rT3 - (inactive)
How would the Thyroid react to cold temperatures in the body
Increase T4/T3 production, increaseing BMR and Body temp.
What enzymes convert T4 int o T3
5’-deiodinase enzymes
What can cause a goiter
Insufficient Iodine. Without iodine, thyroid hormones are not released from thyroglobulin and TSH builds up
What cells can only absorb iodine
Thyroid cells
What is the most extreme version of IDD
Cretinism (congenital hypothyroidism)
What hormone can act in Endocrine, paracrine and Neurocrine communication
CCK
