The Thyroid Gland

Q. Which statement is correct about the thyroid gland ?

1. People who have an over active thyroid gland have a low BMR
2. Thyroid hormones are essential for the early development and maturation of the central nervous system.
3. $T_3$ and $T_4$ stimulate the secretion of TSH by the anterior pituitary
4. Low plasma levels of thyroid hormones leads to thyrotoxicosis

Q.

If thyroid extract is added to the water containing tadpole, it will

1. Retard metamorphosis

2. Hasten metamorphosis

3. Tadpole larva remains in the larvel stage

4. None of these occur

Q.

Name the hormone secreted by thymus gland.

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. Identify the parts labelled A-C in the image given below. Use the hints given below the image for correct identification.


A - cells that form the thyroid follicles
B - cells that secrete calcitonin
C - contains thyroglobulin

1. A - Cuboidal follicular cells, B - C cells, C - Colloid
2. A - Cuboidal follicular cells, B - Colloid, C - C cells
3. A - Cuboidal follicular cells, B - Parafollicular cells, C - C cells
4. A - Cuboidal follicular cells, B - Parafollicular cells, C - Colloid

Q. Toxic agents present in food which interfere with thyroxine synthesis lead to the development of:

1. toxic goiter
2. cretinism
3. simple goiter
4. thyrotoxicosis

Q. Which of the following statements are true/false ?
I. Calcitonin regulates the metabolism of calcium
II. Oxytocin stimulates contraction of uterine muscles during birth
III. Grave's disease is caused by malfunctioning of adrenal gland.
IV. ADH stimulates absorption of water and increase the urine production.

1. I and III are true, II and IV are false
2. I and II are true, III and IV are false
3. I and III are false, II and IV are true
4. I only true, II, III and IV are false
5. I, II and III are true, IV only false