Lung Volumes and Mechanics of Breathing

What happens to the ribs when we inhale?

• Move up and out

• Move down and in

• Move up and in

• Move down and out

What intercostal muscles contract when we breath in?

• External

• Internal

What happens to the diaphragm when we breath out?

• Relaxes and moves downwards

• Contracts and moves downwards

• Contracts and moves upwards

• Relaxes and moves upwards

What happens to the pressure in the thoracic cavity when we breath in?

• Decrease to allow air in

• Increases to allow air in

• Increases to allow air out

• Decreases to allow air out

Gaseous exchange allows the exchange of what gases?

• Oxygen and Carbon Dioxide

• Oxygen and Nitrogen

• Nitrogen and Carbon Dioxide

Oxygen makes what what % of inhaled air

• 21%

• 31%

• 51%

• 81%

What gas has the biggest % in inhaled air

• Oxygen

• Carbon Dioxide

• Nitrogen

• Argon

For diffusion to take place oxygen and carbon must move from which kind of environment

• An area of high to high concentration

• An area of low to low concentration

• An area of high to low concentration

Which of these occur during inspiration

• Diaphragm contracts downwards

• External intercostal muscles contract

• Ribs move up and out

• Pressure decreases and volume increases

The average Tidal volume is 500ML per breath but what is tidal volume

• The volume of air that passes through the lungs each minute

• The volume of air breathed in and out in one breathe

• The volume of air left in the lungs after maximal exhalation

• The volume of air you breathe in one minute