Question

Why do lungs have small external openings when large openings would let in more air?

Answer 1

Lungs have small external openings when large openings would let in more air. This is because small opening help in trapping pathogens and prevent drying of respiratory system.

Further Explanation:

The respiratory system and lungs helps in breathing. When an individual inhaled air they bring oxygen into the body and exhaled out carbon dioxide through the process of exhalation. This exchange of gases referred as respiration. Lungs consist of small alveoli that help in passage of gases. The lungs have small opening which pass less air rather than having large opening which pass more air. This is because:

• It helps in trapping the dust and pathogens like bacteria, fungal spores etc. Larger opening would provide dust and pathogen a wider area to enter into the body. It leads to the infection in the lungs.
• The smaller opening prevents the drying of the respiratory membrane. A moist membrane is essential for the successful exchange of oxygen and carbon dioxide in the lung.

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Answer Details:

Grade: High School

Subject: Biology

Chapter: Respiratory system

Keyword:

Respiratory system, pathogen, bacteria, fungal spore, carbon dioxide, membrane, oxygen, lung, small, large, breathing, inhaled, exhaled.

Answer 2

Answer:

Small external openings of lungs help in two ways:

1. It helps in trapping the dust and pathogens like bacteria, fungal spores et cetera. Larger opening would provide dust and pathogen a wider area to enter into the body.

2. The smaller opening prevents the drying of the respiratory membrane. A moist membrane is essential for the successful exchange of oxygen and carbon dioxide in the lungs.