Question

Which of the following statements are true/false?
i. Thyrocalcitonin regulates the homeostasis of blood calcium levels.
ii. Oxytocin stimulates contraction of uterine muscles during birth.
iii. "Grave's disease" is caused by malfunctioning of the adrenal gland.
iv. ADH stimulates the absorption of water and increase urine production.

• A. i and iii are true ; ii and iv are false
• B. i and ii are true; iii and iv are false
• C. i and iv are false, ii and iii are true
• D. i, ii, iii, are true iv only false

Answer 1

Answer: (B)

• Calcitonin or Thyrocalcitonin is a hormone needed for calcium homeostasis in our body and is secreted from thyroid glands. The parafollicular cells or ‘C’-cells secrete this hormone. It is secreted when the Ca⁺² level is high in the blood.
• Oxytocin stimulates contraction of uterus during parturition. It also stimulates the contraction of mammary glands to initiate ejection or release of milk. So is called birth hormone or milk ejecting hormone.
• Grave’s disease is also known as exophthalmic goitre or Parry’s disease. This occurs due to the over-secretion of thyroid hormones.
• Deficiency of ADH or vesopressin hormone leads to Diabetes insipidus. There is excessive production of dilute urine (diuresis).