1.

(i) Name the substance which is oxidised in body during respiration. (ii) Why lungs are divided into very small sac-like structures?

Answer»

(i) The substances which gets oxidised during respiration are known as respiratory substrates. Examples of some respiratory substrates are glucose, proteins, fatty acids etc. 

(ii) Lungs are divided into small sac like structures called alveoli. These alveoli increase the surface area of lungs for better gaseous exchange.



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