Which does most of the work of the endocrine system?

A. hormones

B. lymphocytes

C. neurons

D. enzymes

its A

Answer: hormones

Explanation:

The endocrine system uses the hormones secreted by its various glands to exert functions such as;

- regulation of bone calcium by Parathormone

- regulation of body metabolism by Thyroxine

- selective reabsorbtion of water from urine by the Anti-diuretic hormone (ADH)

- development of sexual characters in males and females by testosterone and oestrogen respectively.