The most important flight muscles are the pectorals, which correspond to the muscles of your chest :)
The breast muscles are not the most powerful in all birds - only in birds capable of flight. This is because it is the breast muscles that power the wings.
After the pectoralis major, the next most important muscle in the birds is triceps. It is highly developed muscle in birds and used to extend the wings.
The most important muscle in your body is your heart. Everyone should know that.
diaphram
the diaphragm is the muscle(s) that are most important muscle used in inspiration (inhalation)?
Your heart is by far the most important muscle in your body without it none of the others would work.
Name of the muscle is Trapezius.
Diaphragm
The heart is the most important muscle because it has to pump blood constantly thru out the body
The bird's feathers .
skeletal and muscle system!