Thyroid Gland Flashcards
1
Q
What does most of the T3 and T4 bind to in circulation
A
Thyroxine binding globulin
2
Q
What are the symptoms of Hyperthyroidism?
A
-increased metabolic rate, weight loss, increased heat production,
3
Q
What are the causes of hyperthyroidism?
A
Graves’ disease of thyroid neoplasm
4
Q
What is the level of TSH in hyperthyroidism?
A
Low due to negative feedback on the anterior pituitary by high thyroid hormone levels.
5
Q
What are the symptoms of hypothyroidism?
A
Decreased metabolic rate, weight gain, lethargy, myxedema,
6
Q
What are the causes of hypothyroidism?
A
Thyroiditis (Hashimoto’s), Iodine deficiency, decreased TRH or TSH
7
Q
What is the level of TSH in hypothyroidism?
A
High TSH due to decreased feedback inhibition on the anterior pituitary by low thyroid hormone levels.
