I: | plays a very important role in the regulation of a 24-hour (diurnal) rhythm of our body. |
II: | influences metabolism, pigmentation, the menstrual cycle as well as our defense capability. |
I: | is composed of two lobes interconnected with a thin flap of connective tissue called isthmus. |
II: | is composed of follicles and stromal tissues. |
III: | is located in the mediastinum, ventral to aorta. |
Statement I: | Thyroid follicular cells synthesise three hormones: thyroxine, triiodothyronine and thyrocalcitonin. |
Statement II: | Iodine is essential for the normal rate of hormone synthesis in the thyroid. |
I: | Thyroid hormones play an important role in the regulation of the basal metabolic rate. |
II: | Thyroid hormones are most important factors that affect the process of red blood cell formation. |
III: | Thyroid hormones control the metabolism of carbohydrates but not of proteins and fats. |
IV: | Maintenance of water and electrolyte balance is also influenced by thyroid hormones. |
1. | 1 | 2. | 2 |
3. | 3 | 4. | 4 |
1. | four parathyroid glands are present on the back side of the thyroid gland, one pair each in the two lobes of the thyroid gland. |
2. | four parathyroid glands are present on the front side of the thyroid gland, one pair each in the two lobes of the thyroid gland. |
3. | two parathyroid glands are present on the back side of the thyroid gland, one each in the two lobes of the thyroid gland. |
4. | two parathyroid glands are present on the front side of the thyroid gland, one each in the two lobes of the thyroid gland. |
I: | PTH acts on bones and stimulates the process of bone resorption (dissolution/demineralisation). |
II: | PTH stimulates reabsorption of Ca2+ by the renal tubules |
III: | PTH increases Ca2+ absorption from the digested food |
1. | Only I and II | 2. | Only I and III |
3. | Only II and III | 4. | I, II and III |
Assertion (A): | The immune responses of old persons become weak. |
Reason (R): | Thymus is degenerated in old individuals resulting in a decreased production of thymosins. |
1. | (A) is True but (R) is False. |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
4. | (A) is False but (R) is True. |
1. | Sterols | 2. | Catecholamines |
3. | Hopanoids | 4. | Terpenes |