The lymphatic system is part of the circulatory system , comprising a network of lymphatic vessels that carry a clear fluid called lymph (from latin lympha meaning.
The endocrine system refers to the collection of glands of an organism that secrete hormones directly into the circulatory system to be carried toward a distant.
The muscular system is an organ system consisting of skeletal, smooth and cardiac muscles. it permits movement of the body, maintains posture, and circulates blood.
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Operating system - wikipedia, free encyclopedia, An operating system (os) software manages computer hardware resources common services computer programs. operating system essential.
Solar system - wikipedia, free encyclopedia, The solar system  comprises sun objects orbit , orbit orbiting objects orbit .  .