Q8 of 45 Page 178

Which is the correct sequence of air passage during inhalation?

Air enters in our body through nostrils (external most portion of nose). From there it goes into pharynx (passage of air) and then into larynx (voice box). Then air comes into trachea and from here it reaches alveoli of lungs via bronchi and bronchioles.

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4

The following changes take place in an athlete’s body during a 100m race. Which change occurs first?

 5

The diagram shows part of the human gas exchange system.


What are W, X, Y and Z?


 6

An experiment is set up as shown. Flasks 1 and 2 contain lime water. Air is pumped through the flasks.


What is the appearance of lime water flasks 1 and 2 after a period of ten minutes?


 7

The diagram shows the ribs and some of the muscles used in breathing.


Which muscles relax in moving from position x to position y?