Hormones are chemical messengers that are secreted by ductless glands or endocrine glands sent to act on a specific organ in the body to control or regulate different processes. They are transported by the circulatory system to their ‘target’ organ to trigger the required activity.
Hormones in complex organisms (including humans) control a variety of functions like metabolism, growth, sexual development, respiration and different aspects of behaviour.
Hyposecretion: This refers to the condition where the hormone is secreted in lower than normal quantities. Different hormones cause different deficiencies due to hyposecretion.
Hypersecretion: This refers to the condition where the hormone is secreted in excess. Different hormones cause different conditions when secreted in excess.