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Structures in the human breathing system

The Breathing System | Biology for GCSE/IGCSE - Year 11
The Breathing System | Biology for GCSE/IGCSE - Year 11The Breathing System | Biology for GCSE/IGCSE - Year 11

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FAQs on The Breathing System - Biology for GCSE/IGCSE - Year 11

1. How does gas exchange occur in humans?
Ans. Gas exchange in humans occurs in the lungs where oxygen from the air we breathe enters the bloodstream and carbon dioxide, a waste product, is removed from the bloodstream and exhaled.
2. What is the role of the alveoli in gas exchange?
Ans. Alveoli are tiny air sacs in the lungs where gas exchange takes place. Oxygen from the air diffuses into the blood vessels surrounding the alveoli, while carbon dioxide diffuses from the blood into the alveoli to be exhaled.
3. How is oxygen transported in the bloodstream during gas exchange?
Ans. Oxygen is transported in the bloodstream attached to hemoglobin molecules in red blood cells. Hemoglobin binds to oxygen in the lungs and releases it to tissues throughout the body where it is needed.
4. What factors can affect gas exchange in humans?
Ans. Factors such as lung diseases (e.g. asthma, COPD), altitude, exercise, and smoking can affect gas exchange in humans. These factors can impact the efficiency of oxygen and carbon dioxide exchange in the lungs.
5. How does the breathing rate affect gas exchange in humans?
Ans. The breathing rate, or respiratory rate, can affect gas exchange by determining how much oxygen is taken in and how much carbon dioxide is removed from the body. Faster breathing rates can increase oxygen intake and carbon dioxide removal, while slower rates may not be as efficient.
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