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1. (b) to deliver oxygen to the body (c) to remove carbon dioxide from the body

2. (d) diaphragm
3. (a) alveoli
4. (c) tar
5. (d) carbon monoxide

6. (b) cardiovascular system

7. (a) warm-up
8. (c) endurance
9. (b) muscular strength
10. (d) all of the above

Did you know?

Did you know that our lungs serve two important functions? One is to deliver oxygen to our body, ensuring that every cell gets the necessary oxygen it needs to function. The other is to remove carbon dioxide, a waste product produced by our cells. The diaphragm, a muscle located below our lungs, plays a vital role in the process of breathing. Another interesting fact is that within our lungs, there are tiny air sacs called alveoli, where gas exchange between oxygen and carbon dioxide actually takes place. However, smoking can have harmful effects on our respiratory system. The tar present in cigarette smoke can damage the alveoli, making it harder for oxygen to enter the bloodstream. Additionally, carbon monoxide, another component of cigarette smoke, binds to our red blood cells, preventing them from carrying oxygen effectively.