The hormones that have an influence on other endocrine glands of the body, such as the thyroid, gonads, etc., are secreted by:

Which hormone regulates the development of mammary glands and the secretion of milk in them?

Select the correct option for each statement:
$(1)$ Hormones are non-nutrient/nutrient chemicals which act as intercellular messengers and are produced in trace amounts.
$(2)$ The posterior pituitary gland is under the direct neural/endocrine regulation of the hypothalamus.
$(3)$ The hormone produced by the posterior pituitary gland is oxytocin/prolactin.

The mineral element essential for the formation of insulin is

Lorain-Levi syndrome is caused by the deficiency of:

Which of the following is an accumulation and release centre of neurohormones?