________ is secreted by the pineal gland.

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SSC GD 18 Nov 2021 Shift 1 (Official Paper)
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  1. Melatonin
  2. Progesterone
  3. Epinephrine
  4. Insulin

Answer (Detailed Solution Below)

Option 1 : Melatonin
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Detailed Solution

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The correct answer is Melatonin

Key Points

  • Melatonin is secreted by Pineal Gland.
    • It is involved in the regulation of biological rhythms of the body and sleep.
    • It is usually secreted in darkness hence also known as "Dracula of Hormones".
    • Sometimes it can be consumed from external sources by mouth to adjust the body's internal clock, as well as its external supplements.
  • The pineal Gland is situated in the middle of the human brain and is the major site of the body's melatonin.

Important Points

  • Progesterone hormone is released during the course of pregnancy hence also known as pregnancy hormone.
    • It inhibits the contraction of the uterus so that pregnancy can be sustained.
  • Epinephrine also known as Adrenaline, is a hormone produced by adrenal glands and the small number of neurons in the medulla oblongata.
    • It relaxes muscles in the airways and tightens the blood vessels.
  • Insulin is a hormone secreted by the pancreas.
    • It controls the amount of glucose in the bloodstream at any given moment.

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