What organ system generates the heat needed by warm-blooded animals such as humans?

There are eleven major organ systems are present in human and animals. The organ system that generates the heat needed by warm-blooded animals such as humans is the muscular system. Aside from generating heat, the muscular system facilitates movement and locomotion. It produces body movements, maintains posture, and supports the body. Heat is generated thru muscle contractions and as much as 70% of the body heat is produced in the muscle tissue. 

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these macromolecules could either be amino acids, proteins or nucleic acids. they are responsible for the chemical changes and reactions that affects largely the cell and its composition. take for instance the cytoplasm of the cell where these organelles are settled. these simple organelles are composed of macromolecules which ignites and catalyses different functions that enables cells, in macro-perspective in motion and metabolism. in intestines for example, metabolism happens and breaking down parts of a food to simpler compounds that are used and these nutrients delivered throughout the body and again broken down by into smaller components.