Melatonin is produced from
pineal gland
adrenal gland
parathyroid gland
ovary
A.
pineal gland
Pineal gland secretes a hormone called melatonin. This hormone plays a very important role in the regulation of a 24 hour (diurnal) rhythm of our body. It also influences metabolism, pigmentation, the menstrual cycle as well as our defense capability.
Adrenal gland is composed of two types of tissues, adrenal medulla and adrenal cortex. Adrenal medulla, secretes hormones adrenaline or epinephrine and noradrenaline or norepinephrine. Adrenal cortex secretes many hormones called as corticoids.
The parathyroid glands secrete a peptide hormone called parathyroid hormone. This hormone increases the Ca2+ levels in the blood.
Ovary produces two groups of steroid hormones called oestrogen and progesterone.
Which one of the following is wrong for meiosis?
It leads to formation of sister chromatids
It occurs in diploid cell
It occurs in haploid cell
It occurs by splitting of centromeres and separation of sister chromatids
Which one of the following cocci appears like grapes under microscope?
Streptococci
Diplococci
Staphylococci
Pneumococci
The epithelium found in the inner linings of stomach and intestine is
columnar
squamous
stratified
pseudostratified
Which one of the following combination of all three fatty acids are essential for human beings?
Oleic acid, linoleic acid and linolenic acid
Palmitic acid, linoleic acid and arachidonic acid
Oleic acid, linoleic acid and arachidonic acid
Linoleic acid, linolenic acid and arachidonic acid
