Birds Generate a Lot of Heat, Especially During Flight

question 108

Multiple Choice

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

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Definitions:

Membranous Labyrinth

A complex system of membrane-covered tubes and chambers within the inner ear, responsible for hearing and balance.

Semicircular Canal

One of three looped structures in the inner ear that are responsible for maintaining balance by detecting head rotation.

Nerve Endings

The terminations of nerve fibers that are responsible for sensing stimuli from the environment or within the body.

Hair Cells

Sensory cells located in the inner ear, responsible for converting sound vibrations into electrical signals for hearing.