Q7 of 45 Page 178

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


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


While moving from position-x to position-y, the lungs are exhaling out the air. When lungs exhale out the air, both diaphragm & external intercostal muscles relax.

More from this chapter

All 45 →
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?


 8

Which is the correct sequence of air passage during inhalation?