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Breathing and Exchange of Gases

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Difficult Questions

Advanced Zoology

Animal Kingdom
Structural Organisation in Animals
Digestion and Absorption
Breathing and Exchange of Gases
Body Fluids and Circulation
Excretory Products and their Elimination
Locomotion and Movement
Neural Control and Coordination
Chemical Coordination and Integration
Human Reproduction
Human Health and Disease
Biotechnology Principles and Processes
Biomolecules (Zoology)
Evolution (Zoology)
Biotechnology and its Applications
Reproductive Health
  1. When you hold your breath, which of the following gas changes in blood would first lead to the urge to breathe?
    1. rising CO2 concentration
    2. falling CO2 concentration
    3. rising CO2 and falling O2 concentration
    4. falling O2 concentration
Correct Option: A

Chemoreceptors in the medulla get stimulated by increase in CO2 concentration in the blood of arteries. Decrease in O2 concentration has no significant effect on chemoreceptors.


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