When birds fly,increased muscular activity produces large amounts of heat.Excess heat can be dissipated by
A)countercurrent exchange.
B)panting.
C)shivering.
D)sweating.
E)convection through the feathers.

Question

Quizplus · Accepted Answer

When birds fly, increased muscular activity produces large amounts of heat. The excess heat can be dissipated by panting, during which the bird rapidly moves its throat in and out to exchange body temperature with cool outside air. This method helps birds to cool down and maintain their body temperature while flying. Countercurrent exchange is used by birds in their legs to conserve heat, shivering and sweating are not used by birds as a means of heat dissipation, and while convection through feathers may play a small role in cooling, it is not the primary method used by birds.

When Birds Fly,increased Muscular Activity Produces Large Amounts of Heat