Chemical Coordination and Integration

GnRH, a hypothalamic hormone, needed in reproduction, acts on

1. anterior pituitary gland and stimulates secretion of LH and FSH
2. posterior pituitary gland and stimulates secretion of oxytocin and FSH
3. posterior pituitary gland and stimulates secretion of LH and relaxin
4. anterior pituitary gland and stimulates secretion of LH and oxytocin.

Hypersecretion of growth hormone in adults does not cause further increase in height, because

1. epiphyseal plates close after adolescence
2. bones lose their sensitivity to growth hormone in adults
3. muscle fibres do not grow in size after birth
4. growth hormone becomes inactive in adults.

Which of the following pairs of hormones are not antagonistic (having opposite effects) to each other?

1. Aldosterone – Atrial Natriuretic Factor
2. Relaxin – Inhibin
3. Parathormone – Calcitonin
4. Insulin – Glucagon

The amino acid tryptophan is the precursor for the synthesis of

1. estrogen and progesterone
2. cortisol and cortisone
3. melatonin and serotonin
4. thyroxine and triiodothyronine.

Graves' disease is caused due to

1. hyposecretion of thyroid gland
2. hypersecretion of thyroid gland
3. hyposecretion of adrenal gland
4. hypersecretion of adrenal gland.

Name a peptide hormone which acts mainly on hepatocytes, adipocytes and enhances cellular glucose uptake and utilisation.

1. Insulin
2. Glucagon
3. Secretin
4. Gastrin

The posterior pituitary gland is not a 'true' endocrine gland because

1. it is provided with a duct
2. it only stores and releases hormones
3. it is under the regulation of hypothalamus
4. it secretes enzymes.

Which hormones do stimulate the production of pancreatic juice and bicarbonate?

1. Angiotensin and epinephrine
2. Gastrin and insulin
3. Cholecystokinin and secretin
4. Insulin and glucagon

Which one of the following hormones is not involved in sugar metabolism?

1. Insulin
2. Glucagon
3. Cortisone
4. Aldosterone

Which one of the following hormones though synthesised elsewhere, is stored and released by the master gland?

1. Prolactin
2. Melanocyte stimulating hormone
3. Antidiuretic hormone
4. Luteinising hormone