Mechanism of breathing

What are the two components required for changing the pressure inside the lungs?

• Intercostal muscles

• Diaphragm

• Trachea

• Alveolus

The location of diaphragm is at

• the top of ribcage

• the bottom of ribcage

• in front of ribcage

• behind of ribcage

During inhalation, the diaphragm will

• contract and flatten

• relax and flatten

• contract and become dome shape

• relax and become dome shape

Which process is passive?

• Inspiration

• Expiration