Endocrine System
Endocrine System consists of ductless glands that control, communicate, coordinate and integrate various functions of all the body organs by secretions of chemical messenger called hormones.
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Nervous System
The system that controls and coordinates all the activities of various body parts in response to external and internal stimuli by the conduction of nerve impulses is called nervous system.
Health Organizations
The two most important international health organizations are –: WHO (World Health Organization) and Red Cross
Human Circulatory System
All the parts of the body that help in the transportation of various materials in the body, collectively constitute the Circulatory System.