MSH of pars intermedia or middle pituitary is responsible for
Which hormone possesses anti-insulin effect?
Insulin decreases the level of glucose in the blood while cortisol (secreted by middle region of adrenal cortex) increases the blood-glucose level by converting proteins and fats into carbohydrates which are, in turn, converted to glucose.
Addition of a trace of thyroxine or iodine in water containing tadpoles will 
In 1912, Gudernatsch discovered that metamorphosis in frog’s tadpole is controlled by the thyroxine hormone which has the iodine as the main constituent. If thyroxin or iodine is added in water having tadpoles in it, then it increases the rate of metamorphosis in tadpole.
Insulin is 
Insulin is a hormone secreted by the b-cells of pancreas and it controls the sugar level in blood
Occurrence of Leydig cells and their secretion is 
Leydig’s cells are present in testes and they secrete male hormone testesterone.
Small groups of polygonal, large cells present in the connective tissue in between the seminiferous tubules are known as Leydig’s cells are interstitial cells. They secret male sex hormone testosterone
ADH or vasopressin is 
ADH : Antidiuretic hormone – vasopressin in secreted by neurohypophysis (posterior lobe) of pituitary gland. This hormone increases the reabsorption of water from the urine and hence urine gets concentrated and ECF gets diluted. Diabetes insipidus caused by the hyposecretion of ADH.
Gastric secretion is stopped by hormone 
Enterogastrone secreted by the mucosa of duodenum slows gastric contractions and stops the secretion of gastric juice.
Testosterone is produced by 
Male hormone is produced in the testis by cells of 
Male hormones are secreted by the Interstitial or Leydig’s cells present in the stroma of connective tissue in between the seminiferous tubules in testis. They produce androgens (mainly testosterone) Sertoli cells are elongated epithelial cells present inside the seminal vesicle to nourish the growing spermatozoa.
Ovulation is stimulated by 
Luteinizing Hormone (LH) induces the Leideyg’s cells in males to produce testesterone and in female it causes ovulation and secretion of female sex hormone estrogen from mature ovarian follicle & progesterone by corpus luteum.
Function of enterogastrone is 
Enterogastrone is a hormone released by the upper intestinal mucosa that inhibits gastric orotility and secretion.motility and secretion.
Ovulation occurs under the influence of 
Ovulation occurs under the influence of luteinizing hormone-LH secreted by the anterior lobe of pituitary.
The mammalian corpus luteum produces 
Mammalian corpus luteum produces progesterone. It is essential for the continuation of pregnancy and it also stimulates acini glands.
Nicotine acts as a stimulant, because it mimics the effect of 
Nicotine and acetylcholine have the same receptors-Nicotinic cholinergic receptors and hence have the same action.
Which of the following endocrine gland stores its secretion in the extracellular space before discharging it into the blood? 
The thyroid gland stores its hormone secretion thyroglobulin in its follicles called extracellular space before discharing it into the blood.
According to the accepted concept of hormone action, if receptor molecules are removed from target organs, then the target organ will 
The hormones in blood act on specific sites or receptors of target organ. So if we remove the receptor molecule from the target organs, there will be no response.
Which of the following radioactive isotope is used in the detection of thyroid cancer? [1995, 02]
Iodine is an element used by thyroid gland for the synthesis of thyroid hormones. Thus radioactive isotope Iodine -131 is used as radioactive material for detection of thyroid cancer.
Which one of the following hormone stimulates the “let-down” (release) of milk from the mother’s breasts when the baby is sucking ? 
Prolactin is a proteinaceous hormone released by anterior lobe of pituitary. Prolactin supplements the action of gonadal hormones in stimulating the growth and activity of female mammary gland during pregnancy and lactation. Oxytocin released by the posterior lobe of pituitary gland, is important for the mechanism of ejection of milk from the mammary glands due to sucking of breasts by infant. Progesterone, released by corpus luteum brings about pregnancy changes such as uterine growth, implantation of embryo etc. Relaxin is a proteinaceous hormone secreted by corpus luteum towards the end of gestation period for loosening and softening of pelvic ligaments, relaxing of uterus for easing parturition.
According to the “immunity theory” of ageing, the process starts with the gradual atrophy and disappearance of 
According to the immunity theory ageing occurs due to the loss of power of defence against the invasion of germs and pathogens. The process starts with the gradual atrophy and disappearance of the thymus gland during middle age.
In human adult females oxytocin 
Oxytocin also known as pitocin. It is an important hormone which is released in neurohypophysis of pituitary. It stimulate the contraction of smooth muscles. It stimulate labour pain and also increase labour pain. It is a hormone for quick birth. 1Its more secretion results in parturition.
Hormones, thyroxine, adrenaline and the pigment melanin are formed from 
The amino acid glycine forms porphyrin ring in chlorophyll and haeme proteins like haemoglobin. Tryptophan gives rise to plant hormone indole- 3 - acetic acid.
Calcitonin is a thyroid hormone which 
Calcitonin is a polypeptide hormone which lowers calcium and phosphate level of plasma by inhibiting bone degradation and stimulating their uptake by bone parathyroid harmone elevates calcium level in blood.
The most important component of the oral contraceptive pill is 
Use of contraceptive pills is a wide spread form of birth control. contraceptive pills contain estrogen and progesterone. The production of the pituitary hormones FSH & LH in the normal sexual cycle of a female is shut down by these hormones. In the absence of FSH, the ovarian follicles do not ripe and ovulation does not occur in the absence of LH.
Parathormone deficiency produces muscle ramps or tetany as a result of 
Parathormone released by the parathyroid gland elevates the level of Ca2+ in blood. The deficiency of this hormone lowers blood Ca2+. As a result, the excitability of muscles and nerves increases producing tetany -sustained contraction.
Oxytocin helps in 
Oxytocin is also called the ‘child birth hormone’. Prolactin helps in lactation. Luteinizing hormone levels trigger ovulation.