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STD 11 - 19. Chemical coordination and integration — BIOLOGY STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 19. Chemical coordination and integration1 Mark
MCQ
Identify the hormone with its correct matching of source and function.
  • A
    Oxytocin -­ posterior pituitary, growth and maintenance of mammary glands.
  • ✓
    Melatonin -­ pineal gland, regulates the normal rhythm of sleepwake cycle.
  • C
    Progesterone -­ corpus luteum, stimulation of growth and activities of female secondary sex organs.
  • D
    Atrial natriuretic factor -­ ventricular wall, increases the blood pressure.
✓

Answer

Correct option: B.
Melatonin -­ pineal gland, regulates the normal rhythm of sleepwake cycle.
b
(b) : Oxytocin is produced by hypothalamus and generally secreted by posterior pituitary. It stimulates secretion of milk from mammary glands; causes contraction of uterus at the time of child birth. Progesterone is secreted by corpus luteum. It stimulates uterus for pregnancy, implantation, formation of placenta and development of mammary glands.

Atrial natriuretic factor is secreted by atrial wall in response to an increased return of the venous blood. This hormone regulates the blood volume through increased excretion of ions and water.

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