to delay or trigger the next phase of cycle
What you meant must be the adaptive advantage of the frogs' lungs. Frogs are considered as amphibians wherein the have this unique ability to reside either on land or in water. Their specialised lungs could be responsible to these which makes them capable of breathing oxygen in water and land.
It is a catecholamine. It is also known as adrenaline. It will increase the heart rate and other flight or fight responses.
