Mechanics of breathing and lung volumes

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

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

Which of the following happens when you exhale?

• chest cavity expands

• your lumgs become smaller

• your chest cavity becomes smaller

• your lungs take in and give off oxygen

Which of the following shows what happens to the chest cavity when air rushes into the lungs?

• decrease in volume

• deflates

• expands

• relaxes

How do you describe the condition of the diaphragm as one exhales?

• the diaphragm contracts

• the diaphragm relaxes

• the diaphragm goes down

• both a and c