Question

(i) Label parts 1,2,3 and 4
(ii) What is the function of the part labelled 4? List any one
characteristics of part 4 that helps it to carry out its function.is
(iii) How are the lungs able to expand and contract without any
damage to their walls?

Answer 1

Answer:

i) 1= trachea/ wind pipe

2= Bronchi

3= bronchioles

4= alveolar sacs

ii) The increased surface area of lungs results in increased no. of alveolar sacs which will help in greater absorption of Oxygen.(remember that our each body cell needs O2 for producing their own energy in the form of ATP by cellular respiration). alveolar sac helps in exchanging O2 and CO2.

iii) Lungs are made up of muscle which can relax and contract, also the expansion and contraction of lungs is carried out by intercoastal muscles, diaphragm and ribs.

Explanation:

image has been provided

If you found the solution helpful, then feel free to rate it

Thank you !