I believe it is Dopamine, I could be wrong tho.
Skeletal muscle: multinucleated, striated; attached to bones producing locomotion, general support and posture; producing heat. Contraction is voluntary, and not long-sustained. b. Cardiac muscle: found only in the heart and responsible for contraction of cardiac tissue and distribution of blood.
The nutrient that provide 4 cal per gram that is needed to build and repair body tissue is Protein
