Regulation of Thyroxine by TSH

Q. Blood levels of which of the following substances is decreased in Graves’ disease?

1. $T_3$
2. $T_4$
3. DIT
4. TSH

Q. Low levels of TSH can be found in

1. Cretinism
2. Hyperthyroidism
3. Hypothyroidism
4. Jet lag

Q. TSH(thyroid stimulating hormone) is produced by _____________.

1. Adrenal cortex
2. Middle pituitary lobe
3. Anterior pituitary lobe
4. Posterior pituitary lobe

Q. Low levels of TSH can be found in

1. Cretinism
2. Hyperthyroidism
3. Hypothyroidism
4. Jet lag

Q.

Ca++ level is controlled by

1. Thyroid

2. Hypothalamus

3. Pituitary

4. Thyroid and Parathyroid

Q.

Hyperthyroidism is excessive secretion of thyroid hormones. This can happen due to

1. Excess secretion of thyroid hormones by the thyroid gland

2. Excess secretion of TSH from the pituitary gland

3. Excess secretion of TSH-RH from the hypothalamus

4. All the above

Q. diethylstibestrol is a chemical carcinogen for which of the cancers?

Q. In a normal thyroid gland of an adult, triiodothyronine is mostly derived from

1. Thyronine
2. Thyromine
3. Thyroxine
4. All of the above

Q. Parafollicular cells of thyroid secrete hormone for controlling level of

1. K${}^{+}$
2. Na${}^{+}$
3. Ca${}^{2+}$
4. Mg${}^{2+}$

Q. Short / Long answer type questions.
A patient with symptoms of hyperthyroidism is found to have circulating antibodies against the receptors for the thyroid hormones. Can you deduce the cause of the hyperthyroidism?