Along with the internal and external intercostal muscles, what is a main muscle of the pulmonary system?
a. deltoid
b. diaphragm
c. gastrocnemius
d. semitendinous

Many body systems work together for proper functioning of the body and to maintain internal homeostasis. the works to break down food eaten before exercising. the takes in the nutrients obtained from the food. the body sweats as a mechanism to cool off, because the is working to flush out toxins.