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

Select the correct option regarding the endocrine systems of invertebrates and vertebrates.

Select the correct option for the following statements:
$(1)$ Hyposecretion of growth hormone leads to gigantism / dwarfism.
$(2)$ Glucocorticoids are steroid / protein type hormones.
$(3)$ In females,luteinizing hormone induces ovulation / inhibits ovulation from the Graafian follicle.

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.

Which cranial nerve is responsible for the regulation of the heartbeat?

The following table summarizes some endocrine glands,their hormones,and their functions in the human body. Identify the correct options for the three blanks $A, B$,and $C$.

Endocrine Gland	Hormone	Function
$A$	Estrogen	Maintenance of secondary sexual characters
Alpha cells of Islets of Langerhans	$B$	Increases blood glucose level
Anterior Pituitary	$C$	Hypersecretion causes gigantism