Electron transport chain <span>produces the most ATP</span>
The circulatory system<span> is the transport </span>system<span> for </span>endocrine<span> information. While the nervous </span>system<span> uses neurons, the </span>endocrine<span> chemicals and hormones must circulate through the body via blood vessels. Many glands in your body secrete hormones into the blood.</span>
Glucose and oxygen , in other words sugar & oxygen