Calcitonin lowers the calcium level in the blood. This is secreted by

Which of the following disorders is related to the thyroid gland?

Grave's disease is related to which gland?

High incidence of goitre is seen in the mountainous region because of

Consider the following statements with respect to Calcitonin:
$I$. It is non-iodised.
$II$. It is secreted by parafollicular cells.
$III$. It regulates the calcium level in blood.
$IV$. It is also called as $TCT$ (Thyrocalcitonin).
$V$. It is a hyperglycemic agent.
Select the option containing correct statements from the above given statements.

Which endocrine gland stores its secretion in the extracellular space before discharging it into the blood?