Fill in the blanks by selecting the appropriate alternative from those given in brackets.

(i) Regulation of activities inside the body are brought about by …………… and …………… systems. (nervous/digestive/endocrine)

(ii) Hormones are secreted directly into the …………… . (organs/lymph/blood)

(iii) Chemically, some hormones are …………… , some steroids, some …………… . (proteins/amines/carbohydrates)

(iv) Both …………… or deficiency of hormones lead to serious consequences. (excess/absence)

(v) Hormones produced in one species usually show …………… influence in other species. (similar/different)

Mention the three types of cells of the islets of Langerhans and the name of the hormone they secrete.

Mention the two principal ways in which insulin acts :

Name the following conditions :

(i) Passage of much glucose in urine

(ii) Overdose of insulin makes the diabetic patient unconscious