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it is an organ, it doesn't belong to any other organs in the body but it does belong to a system in the body the digestive system.
The bicep is in the muscular body system.
To answer this question, you have to first understand what endothermy is. Endothermy is an animal's ability to control its body temperature. It affects an animal's need for food because regulating a body temperature requires huge amounts of energy, so the animal must eat more even when food is not readily available.
Respiratory System
The cardiovascular system.
nervous system
The immune system
reproductive system
the digestive system
skeletal system :)
Circulatory system
The male reproductive system.