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.
Hepatic portal System
All the portal veins that carry their contents into liver collectively constitute the Hepatic Portal System.
Human Excretory System
The process of removal of chemical waste (mainly nitrogenous) from the body is known as excretion and the organ system involved is called Excretory System.
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.