Daily Quiz

Endocrine System quiz set-1

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Q1: MSH of pars intermedia of middle pituitary is responsible for

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Pars intermedia is the boundary between the anterior and posterior lobes of the pituitary. It contains three types of cells – basophils, chromophobes and colloid- filled cysts. This area produces melanocyte stimulating hormone or MSH. It stimulates the synthesis of black pigment melanin in the skin and also causes dispersion of melanin granules in the pigment cells, thereby darkening the colour in certain animals (fishes; amphibians). In man it has no such role.

Q2: Which hormone possesses anti-insulin effect?

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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.

Q3: Addition of a trace of thyroxine or iodine in water containing tadpoles will

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In 1912, Gudematsch discovered that metamorphosis in frog’s tadpole is increased by the thyroxine hormone which has the iodine as the main constituent. If thyroxine or iodine in added in water having tadpoles in it, then it increases the rate of metamorphosis in tadpole.

Q4. Insulin is a

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Insulin is a hormone secreted by the (3-cells of the pancreas on stimulation by a rise in blood glucose level.

Q5. Occurrence of Leydig’s cells and their secretion is

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A pair of testes is situated in the scrotum of male. The connective tissue present between the seminiferous tubules in a testis contains small clusters of endocrine cells called interstitial cells or Leydig’s cells. These cells secrete various male sex hormones called androgens. The principal androgen is testosterone.

Q6. ADH or vasopressin is

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Antidiuretic hormone (ADH) or vasopressin is secreted by the posterior lobe of the pituitary gland. It increases the reabsorption of water in the distal convoluted tubule, collecting tubules and collecting ducts of the nephrons of the kidneys. As a result, the reabsorption of water from the glomerular filtrate is increased. Enzyme that hydrolysis peptide is known as peptidase. A hormone that promotes glycogenosis is glucagon and adrenaline. Energy rich compound connected with muscle contraction is ATP.

Q7. Gastric secretion is stopped by hormone

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Enterogastrone is secreted by duodenal epithelium and it slows gastric contractions to delay its emptying and also stops secretion of gastric juice. Gastrin stimulates secretion of gastric juice. Cholecystokinin stimulates release of enzymes in pancreatic juice and release of bile from gall bladder. Cholecystokinin is also known as pancreozymin.

Q8. Testosterone is produced by

Correct! Wrong!

A pair of testes is situated in the scrotum of male. The connective tissue present between the seminiferous tubules in a testis contains small clusters of endocrine cells called interstitial cells or Leydig’s cells. These cells secrete various male sex hormones called androgens. The principal androgen is testosterone.

Q9. The immediate cause of induction of ovulation in human female is the large plasma surge of

Correct! Wrong!

LH (luteinising hormone) is released by anterior lobe of pituitary gland. It causes ovulation, secretion of estrogen from mature ovarian follicle and progesterone from corpus luteum. FSH stimulates sperm formation in the male and growth of ovarian follicles in the female. Progesterone suspends ovulation during pregnancy, fixes the foetus to the uterine wall, forms placenta and controls the development of the foetus in the uterus. Estradiol is the major estrogen in humans.

Q10. According to the accepted concept of hormone action, if receptor molecules are removed from target organs, then the target organ will

Correct! Wrong!

The molecules of hormones that are amino acid derivatives, peptides Ci proteins are large and insoluble in lipids, and cannot enter the target cell. Therefore, they act at the cell surface. They bind to specific receptor molecules located on the surface of the cell membrane. Therefore, if receptor molecules are removed from target organs, then the target organ will not respond to the hormone.

Endocrine System Part-1
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