Mechanism Of Inspiration/Inhalation

Question 1

Step 1 Of Inspiration

Answer 1

External intercostal muscles contract, internal intercostal muscles relax.

Question 2

Step 2 Of Inspiration

Answer 2

Ribs are pulled upwards and outwards increasing the volume in the thorax.

Question 3

Step 3 Of Inspiration

Answer 3

Diaphragm muscle contracts, causing it to flatten increasing the volume in the thorax.

Question 4

Step 4 Of Inspiration

Answer 4

Increase in volume of the thorax causes a decrease in the pressure inside the lungs.

Question 5

Step 5 Of Inspiration

Answer 5

Atmospheric pressure (air pressure outside the lungs) is greater than inside the lungs.

Question 6

Step 6 Of Inspiration

Answer 6

Air flows into the lungs down a pressure gradient. This is inspiration - one breath in.