i think its the indocrine :/
Our glands produce heat, which can cause a fever for us. Thebody systemthat produces the most body heat within us is our sweating system.
Liver
Muscle movement produces the most body heat.
The system that creates the most body heat is an exothermic system. These systems are known for expelling excess heat.
your head
The muscular system uses movement via contractions and creates most body heat.
The endocrine system is responsible for producing most of the hormones in the human body. These chemical messengers regulate various bodily functions and processes, such as metabolism, growth, and reproduction. The endocrine system includes glands like the pituitary, thyroid, adrenal, and pancreas.
The cardiovascular system, specifically the bone marrow within the skeletal system, produces most of the blood cells for the body. Stem cells in the bone marrow differentiate into red blood cells, white blood cells, and platelets, which are essential components of blood.
Muscles
the brain
Endocrine System
It depends on the system. Most anatomists agree that there are ten systems in the human body, and each one produces a different product, or has a different function.