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Investigating the Differences in Inspired & Expired Air | Biology for GCSE/IGCSE - Year 11 PDF Download

Investigating the Differences in Inspired & Expired Air

  • A basic experimental setup can be utilized to examine the differences between inhaled and exhaled air.

Investigating the Differences in Inspired & Expired Air | Biology for GCSE/IGCSE - Year 11

  • Inhalation draws air through boiling tube A.
  • Exhalation directs air into boiling tube B.
  • Lime water is initially clear but turns cloudy (or milky) when carbon dioxide is bubbled through it.
  • The lime water in boiling tube A will stay clear, while the lime water in boiling tube B will turn cloudy.
  • This demonstrates that exhaled air has a higher percentage of carbon dioxide compared to inhaled air.

Question for Investigating the Differences in Inspired & Expired Air
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What can be observed when exhaled air is bubbled through lime water compared to inhaled air?
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FAQs on Investigating the Differences in Inspired & Expired Air - Biology for GCSE/IGCSE - Year 11

1. What is the difference between inspired and expired air?
Ans. Inspired air is the air that is breathed in, while expired air is the air that is breathed out. Inspired air contains more oxygen and less carbon dioxide compared to expired air.
2. How do inspired and expired air differ in terms of temperature and humidity?
Ans. Inspired air is typically cooler and drier compared to expired air, which is warmer and more humid due to the exchange of gases and moisture in the lungs.
3. What gases are exchanged between inspired and expired air in the respiratory system?
Ans. The main gases exchanged between inspired and expired air are oxygen and carbon dioxide. Oxygen is taken in during inspiration, while carbon dioxide is released during expiration.
4. How does the body ensure that inspired air is suitable for gas exchange in the lungs?
Ans. The body filters, warms, and humidifies inspired air as it passes through the nasal passages and respiratory system to make it suitable for gas exchange in the lungs.
5. Why is it important to understand the differences in inspired and expired air for respiratory health?
Ans. Understanding the differences in inspired and expired air helps in comprehending how the respiratory system functions and how the exchange of gases impacts overall health and well-being. It also aids in diagnosing and managing respiratory conditions effectively.
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