Migrating birds often cross the Gulf of Mexico in a single flight thus their flight muscles demand extreme endurance.An examination of the muscles used to perform this activity would reveal
A) little to no myoglobin.
B) one-to-two nuclei per muscle fiber.
C) an abundance of blood vessels.
D) a high number of intercalated discs.
E) numerous gap junctions.

Question

Quizplus · Accepted Answer

The extreme endurance required for migrating birds to cross the Gulf of Mexico in a single flight requires a high amount of oxygen delivery to the flight muscles. Thus, an examination of the muscles used for this activity would reveal an abundance of blood vessels, which allows for increased oxygen delivery to the muscles.

Migrating Birds Often Cross the Gulf of Mexico in a Single