Q32 of 367 Page 47

Define breathing. State the differences between breathing and respiration.

Breathing is the process by which organisms takes oxygen from the air and releases carbon dioxide.

Breathing	Respiration
It is a simple process.	It is a complex process.
It involves taking oxygen from the air and releasing carbon dioxide in the air.	It involves breathing and oxidation of food to release energy.
It is a physical process.	It is a bio-chemical process.

What type of respiration takes place in human muscles during vigorous physical exercise? Give reason for your answer.

Name the type of respiration in which the end products are:

(a) C₂H₅0H and C0₂

(b) C0₂ and H₂0

Give one example of each case where such a respiration can occur.

What are the different ways in which glucose is oxidised to provide energy in various organisms? Give one example of each.

Explain why, when air is taken in and let out during breathing, the lungs always contain a residual volume of air.