Question

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1. All living things respire. Do all living things breathe? Describe how they obtain their oxygen.

2. Respiration is a chemical reaction.
(a) Where does it take place?
(b) What type of chemical reaction is it?
(c) Why is it important for living cells?

3. Respiration releases energy from food. Explain how the energy came to be present in the food.

4. Discuss how the structure of the lungs, including the alveoli, is designed to make gas exchange as efficient as possible.

5. Explain the mechanism of breathing in human beings.

6. How does gaseous exchange take place in
(i) earthworms
(ii) frogs
(iii) insects
(iv) fish?

7. Under what conditions do our muscles breathe anaerobically? How can we get relief from cramps?

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Answer 1

Answer:

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