2. Ventilation

What happens to the intercostal muscles and diaphragm during inspiration (breathing in)?

• Stretch

• Relax

• Contract

• Lengthen

What happens to the volume of the thorax (chest) during expiration (breathing out)?

• Increases

• Decreases

• Stays the same

What happens to the ribs during expiration (breathing out)?

• Contract

• Relax

• Move up and out

• Move down and in

When the volume of the thorax (chest) increases during inspiration, what happens to the pressure?

• Increases

• Decreases

• Stays the same

What happens to the diaphragm during expiration (breathing out)?

• Contracts and returns to dome position

• Relaxes and flattens

• Relaxes and returns to its dome position

• Contracts and flattens

Why does air move into the lungs during inspiration?

• The volume of the thorax increases, so the thoracic pressure increases above atmospheric pressure, sucking air in

• The volume of the thorax increases, so the thoracic pressure drops below atmospheric pressure, sucking air in

• The volume of the thorax decreases, so the thoracic pressure drops below atmospheric pressure, sucking air in

• The volume of the thorax decreases, so the thoracic pressure increases above atmospheric pressure, sucking air in

Which picture shows expiration taking place?

• A

• B

What does the bell jar represent in the model of the respiratory system?

• Diaphragm

• Lungs

• Rib cage

• Trachea

When the rubber sheet is pushed up from position X to Y in the diagram, what happens to the volume and pressure inside?

• Volume increases

  Pressure decreases

• Volume increases

  Pressure increases

• Volume decreases

  Pressure increases

• Volume decreases

  Pressure decreases

What will happen to the balloons when the rubber sheet is pushed up from position X to Y?

• Deflate

• Inflate

• No change