1. Which cells secrete T3 and T4? Thyroid follicular cells
2. What is the most common cause of hypothyroidism? Grave's disease
3. What hormone does the parafollicular cells or C cells produce? Calcitonin
4. What substance is needed for the synthesis of thyroid hormone? Iodine
5. TSH is release from what endocrine gland? Anterior Pituitary Gland
6. Release of TRH and TSH is due to an elevated level of T3.
7. High iodine levels suppresses what hormone secretion? T3/T4
8. TSH promotes normal development and activity of the thyroid gland.
9. Low blood levels of T3 and T4 stimulate the Hypothalamus to secrete TRH.
10. What is the other name for thyroxine? Tetraiodothyronine
Grace is a new freshmen college student who hates herself for she's been gaining weight and her neck looks fat. She also has odd butterfly shaped swelling across the front of her neck under her chin. She's also been feeling tired and mentally dull.
The probable diagnosis of the patient is that she has enlarged thyroid gland or goiter. The goiter is probably due to hypothyroidism which is causing the weight gain, fatigue and mental dullness. Thyroid gland does not produce enough thyroid hormone that cause the hypothyroidism of the patient. Hypothyroidism means that T3 and T4 are lessen in number and these two hormones are needed for the normal development of the brain causing the mental dullness of the patient.