Arrange the following events in the correct sequence for the regulation of blood sugar level:
$(i)$ Increase in blood sugar level
$(ii)$ Increase in circulating glucagon
$(iii)$ Release of glucose from glycogen
$(iv)$ Decrease in blood sugar level

Body coordination is exhibited by

The hypothalamic hormones reach the pituitary gland through$:-$

Which of the following statements are true/false?
$(a)$ Calcitonin regulates calcium metabolism.
$(b)$ Oxytocin stimulates contraction of uterine muscles during childbirth.
$(c)$ Graves' disease is caused by the underactivity of the adrenal gland.
$(d)$ $ADH$ stimulates water reabsorption and increases urine production.

From the perspective of embryonic origin,which of the following is ectodermal?

$I.$ Somatostatin inhibits intestinal absorption of glucose.
$II.$ Leydig cells secrete progesterone.
$III.$ Melatonin is secreted by the pineal gland.
$IV.$ Myxoedema is a thyroid disorder.
$V.$ Neurohypophysis secretes $ACTH$.
Select the correct statements and choose the option.