Tag: mechanism of respiration in animals

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Multiple choice biology human body respiration in humans mechanism of respiration in animals human lungs

Which one of the following statements is incorrect?

  1. The residual air in lungs slightly decreases the efficiency of respiration in mammals

  2. The presence of non-respiratory air sacs, increases the efficiency of respiration in birds

  3. In insects, circulating body fluids serve to distribute oxygen to tissues

  4. The principle of counter current flow facilities efficient respiration in gills of fishes
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Residual air in the lungs is essential to keep the alveoli from collapsing between breaths; it does not decrease the efficiency of respiration but rather maintains structural integrity. The other statements correctly describe respiratory adaptations in birds, insects, and fish.

Multiple choice biology human body respiration in humans mechanism of respiration in animals human lungs

Lungs do not collapse between breaths and some air always remains in the lungs which can never be expelled because.

  1. Pressure in the lungs is higher than the atmospheric pressure

  2. There is negative pressure in the lungs

  3. There is negative intrapleural pressure pulling at the lung walls

  4. There is positive intrapleural pressure
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The lungs remain inflated because the intrapleural pressure is lower than the intrapulmonary pressure (negative pressure), which pulls the lungs outward against the chest wall, preventing collapse.