T3, T4 and Their Functions

Q. Which of the following is not a function of the thymus gland?

1. Development of immune system
2. Differentiation of T-lymphocytes
3. Antibody production
4. Regulate blood calcium level

Q. A tadpole with surgically removed thyroid gland can be made to metamorphose if

1. given an injection of growth hormone
2. given an injection of oxytocin
3. given an injection of thyroxine
4. all of the above

Q.

Thyroid hormones synthesized in cuboidal epithelium are stored as

1. Tyrosine molecules in follicular cells

2. Thyroglobulin colloids in lumen

3. Iodine molecules in lumen

4. None of the above

Q.

Amino acid which takes part in the formation of thyroxine is

1. Thyroglobulin

2. Lysine

3. Iodine

4. Tyrosine

Q.

The amino acid tyrosine is the precursor for the synthesis of
(i) Melatonin
(ii) Triiodothyronine
(iii) Thyroxine
(iv) Calcitonin

1. i and ii
2. ii and iii
3. iii and iv
4. i and iv

Q. Which of the following statements concerning thyroid function are correct?

1. T3 and T4 stimulate the secretion of TSH by the anterior pituitary
2. People who have an underactive thyroid gland have a low BMR
3. Most of the iodine in the body is present in the thyroid gland
4. Thyroid hormones are essential for the early development and maturation of the central nervous system