Question

Direction : Refer to the given figure and select the correct options for the questions that follow.

Which of these is incorrect regarding the given mechanism of breathing?

• A. Volume of thorax decreases
• B. Ribs and sternum are raised
• C. Diaphragm relaxes and arches upwards
• D. All of the above

Answer 1

The correct option is B Ribs and sternum are raised

B. Ribs and sternum are raised

Solution : During expel of air from lungs the volume of thorax decreases as it recoils and the diaphragm pushes as it relaxes. The ribs and sternum are relaxed and arch downwards pushing the air out.

So the correct answer is " Ribs and sternum are raised".