there are so many units for sytem length and distance .inches come under the system of length and distance.
The electrical system
They belong to the nervous system
The kidneys belong to the excretory system.
Veins belong to the circulatory system, because they transport blood there for they belong to the circulatory system.
The eyes belong to the Nervous system.
Arteries and veins belong to the cardiovascular system.
The lungs belong to the Respiratory System.
Livers of all animals belong to the digestive system.
what part of of organ system that the skin belong
The digestive system.
Mixed Economy
Tendons belong to the musculoskeletal system in the human body.