$5$-Hydroxytryptamine ($5$-$HT$) is known as:

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.

Complete the following analogies:
$1$. Antidiuretic hormone : Diabetes insipidus :: $\beta$-cells of pancreas : ......
$2$. Corpus luteum : Progesterone :: Leydig cells : ......
$3$. $GIP$ : Gastric inhibitory peptide :: $CCK$ : ......

Intercellular communication in humans takes place by:

The nervous system and endocrine glands are

Diagrammatically indicate the location of the various endocrine glands in our body.