How are birds able to get fresh air even when they are exhaling?

What will be an ideal response?


Birds have posterior air sacs that fill with air during inspiration and empty into the lungs during exhalation. This supplies oxygen to the lungs continuously, even when birds are exhaling.

Biology & Microbiology

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Phospholipid molecules that prevent the alveoli from collapsing are known as ________

A) laryngitis B) surfactant C) mucus D) plasma

Biology & Microbiology

Autoimmune diseases and immunodeficiencies are studied and treated by immunopathologists.

Answer the following statement true (T) or false (F)

Biology & Microbiology

Animal A can breed with animal D and produce a fertile offspring, animal C. If animal A breeds with animal B, they have a sterile offspring, animal E. The animals that belong to the same species are 

A. A and E. B. A and B. C. A and C. D. B and E.

Biology & Microbiology

An enzyme that breaks down the superoxide (O2-) is:

A) hydrogen peroxide B) vitamin C C) superoxide dismutase D) glutathione E) catalase

Biology & Microbiology