A unique feature of the avian respiratory system is the presence of air sacs. Which of the following is NOT a function of these air sacs?
Reduce the weight of the bird
Act as bellows to move air through the lungs
Direct gas exchange with the blood
Help maintain a unidirectional airflow through the lungs
Related Questions
A unique feature of the avian respiratory system is the presence of air sacs. Which of the following is NOT a function of these air sacs?
Reduce the weight of the bird
Act as bellows to move air through the lungs
Direct gas exchange with the blood
Help maintain a unidirectional airflow through the lungs
