Which of the following is true?
1. Hormones regulate cellular functions, and generally negative feedback regulates hormone levels.
2. The circulating level of a hormone is held constant through a series of positive feedback loops.
3. Both lipid-soluble hormones and water soluble hormones bind to intracellular protein receptors.
4. The ducts of endocrine organs release their contents into the bloodstream.

All the following are secreted by the anterior pituitary except:-

1. Prolactin

2. Somatotropin

3. Vasopressin

4. Gonadotropins

Identify the incorrect statement:
1. In males FSH regulates spermatogenesis
2. Thyroid gland produces T3 and thyroxine (T4) hormones
3. ACTH stimulates secretion of glucocorticoids
4. PTH is a hyperglycemic hormone

Hormones that act by interacting with intracellular include all the following except:
1. Thyroxin
2. Estrogen
3. Epinephrine
4. Cortisol 

The amino acid derivative among the following hormone is:-

1. Insulin
2. Epinephrine
3. Estradiol
4. Testosterone

Androgenic steroids in females are secreted by:
1. pineal gland
2. Testes
3. Adrenal cortex
4. Hypothalamus

Which of the following hormones does not have an intracellular receptor?
1. Estradiol
2. Thyroxin
3. Adrenocorticotrophic hormone
4. Cortisol

Hyperthyroidism [Graves' disease] is characterized by all the following except:

1. Toxic goiter

2. Exopthalmos

3. Bradycardia

4. Muscle weakness and termors

ACTH controls the secretion of:
1. cortisol
2. aldosterone
3. epinephrine
4. testosterone

Hypersecretion of growth hormone in adults does not cause further increase in height because 
1. growth hormone becomes inactive in adults
2. epiphyseal plates close after adolescence 
3. bones loose their sensitivity to growth hormone in adults 
4. muscle fibres do not grow in size after birth