A Chemical substance produced in the body that controls and regulates the activity of certain cells or organs . Many hormone are secreted by special glands, such as thyroid hormone produced by the thyroid gland .

1. HORMONAL CONTROL OF
REPRODUCTION CYCLE

2. INTRODUCTION :-
HORMONE:-
 A Chemical substance produced in the body
that controls and regulates the activity of
certain cells or organs .
 Many hormone are secreted by special glands,
such as thyroid hormone produced by the
thyroid gland .