Which hormone is secreted more in dark condition?

Solution

Melatonin, secreted by the pineal gland, stimulates the concentration of pigment granules in the melanocytes, lightening the skin colour.

ANF is a peptide hormone and is secrected from

Calcitonin is a thyroid hormone which

Solution

Calcitonin is a polypeptide hormone which lowers calcium and phosphate level of plasma by inhibiting bone degradation and stimulating their uptake by bone parathyroid hormone elevates calcium level in blood.

Which of the following endocrine gland stores its secretion in the extracellular space before discharging it into the blood?

Solution

The thyroid gland stores its hormone secretion thyroglobulin in its follicles called extracellular space before discharging it into the blood.

The hormone responsible for the regulation of metabolism of calcium and phosphorus is secreted by

Solution

Parathyroid and thyroid hormones regulates the amount of calcium and phosphate in extra cellular fluid. It promotes the absorption of calcium from food in intestine, accelerates elimination of phosphates in urine.

Melanin protects us from

Solution

Melanin is secreted from the intermediate lobe of pituitary. Melanin mainly protects the skin from harmful effects of UV-rays. People living in tropics tend to disperse more melanin in their skin – an adaptive feature.

Which hormone acts on exocrine part of pancreas?

Progesterone, the component of the oral contraceptive pills, prevents pregnancy by

preventing the cleavage of the fertilized egg
preventing the formation of ova
blocking ovulation
creating unfavourable chemical environment for the sperms to survive in the female reproductive tract

Solution

Contraceptive pills have estrogen and progesterone. Progesterone suppresses ovulation and production of LH while estrogen suppresses the production of FSH.

Melanocyte stimulating hormone (MSH) is produced by

Solution

The intermediate lobe (pars intermedium) of the pitutary gland secretes MSH which causes dispersal of pigment granules in the pigment cells which give colour to the skin.

Melatonin is produced by

Solution

Melatonin is secreted by pineal gland present between the cerebral hemispheres. Melatonin concentration in blood follows a diurnal cycle, it rises in the evening and drops at noon. Melatonin lightens skin colour in certain animals and regulates working of gonads.

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