ATP is the immediate source of energy for muscle contraction. In the pectoralis (flight) muscle of the ruby-throated hummingbird (Archilochus colubris), the resting concentration of ATP is approximately 9.1 × 10-3 mmol g-1. During rapid hovering flight, ATP in this muscle is hydrolysed at a rate of approximately 6.5 mmol kg-1 s-1.
Calculate how long this hummingbird could sustain hovering flight if ATP was not continuously resynthesised. Show your working.