Chapter 13: Thyroid Hormon

Question 1

what is the overall function of the thyroid hormone?

Answer 1

to increase metabolic rate

Question 2

how does the thyroid hormone increase metabolic rate?

Answer 2

increases enzyme levels and the number of mitochondria in cells

Question 3

thyroid hormone secretion is controlled primarily by the what?

Answer 3

thyroid stimulating hormone which is secreted by the anterior pituitary gland

Question 4

what is the secretion of the thyroid stimulating hormone regulated by?

Answer 4

a hypothalamic releasing hormone called thyrotropin-releasing hormone

Question 5

under secretion of the thyroid hormone is called

Answer 5

hypothyroidism: metabolic rate decreases 40-50%

symptoms include: weight gain, low body temp, slow pulse, slow reflexes, diminished alertness, fatigue

Question 6

over secretion of thyroid hormone is called

Answer 6

hyperthyroidism: metabolic rate can increase 60-100% above norm.
symptoms: weight loss despite an increase in appetite and food intake, poor tolerance to heat, fast pulse, irritability, fatigue but unable to sleep