A) pineal gland
B) adrenal gland
C) parathyroid gland
D) ovary
Correct Answer: A
Solution :
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 (i) Adrenal medulla, secretes hormones adrenaline or epinephrine and noradrenaline or norepinephrine. (ii) Adrenal cortex secretes many hormones called as corticoids. The parathyroid glands secrete a peptide hormone called parathyroid hormone. This hormone increases the \[\text{C}{{\text{a}}^{\text{2+}}}\] levels in the blood. Ovary produces two groups of steroid hormones called oestrogen and progesterone.
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