Birds generate a lot of heat, especially during flight. Yet the adipose tissue under their skin and the feathers atop their skin make it difficult to eliminate excess heat across the skin. Which of the following alternatives can absorb body heat and eliminate it from the bird most effectively?
A) air in the air sacs
B) lymph in the lymphatic vessels
C) blood in the vessels
D) blood in the heart
E) urine in the bladder

Question

Quizplus · Accepted Answer

Air in the air sacs can absorb body heat and eliminate it from the bird most effectively. The air sacs are thin-walled and are in close proximity to many blood vessels, allowing for efficient heat exchange with blood circulating through the bird's body. Additionally, the constant flow of air in and out of the air sacs during breathing helps to regulate the bird's body temperature.

Birds Generate a Lot of Heat, Especially During Flight