A hormone responsible for the normal sleep-wake cycle is:

1. epinephrine

2. gastrin

3. melatonin

4. insulin

Hormones are called chemical signals that stimulate specific target tissues. Which is the correct location of these receptors in of protein hormones?

1. Extra cellular matrix

2. Blood

3. Plasma membrane

4. Nucleus

Match the following columns.

Which of the following does not play any role in calcium balance in the human body?

1. Vitamin-D

2. Parathyroid hormone

3. Thyrocalcitonin

4. Thymosin

All the following tissues in mammals, except one, consists of a central ‘medullary’ region surrounded by a cortical region. Mark the wrong entry:

1. ovary

2. adrenal

3.  liver

4.  kidney

Which of the following conditions is not linked to deficiency of thyroid hormone?

1. Cretinism

2. Goitre

3. Myxoedema

4. Exophthalmia

Cortisol is secreted from

1. pancreas

2. thyroid

3. adrenal

4. thymus

Corpus luteum secretes a hormone called:

1. prolactin

2. progesterone

3. aldosterone

4. testosterone

Leydig cells produce a group of hormones called:

1. androgens

2. estrogens

3. aldosterone

4. gonadotropins

In the mechanism of action of a protein hormone, one of the second messengers is

1. Cyclic AMP

2. Insulin

3. T₃

4. Gastrin