Lab quiz

Explain Boyle’s law. what is the relationship between pressure and volume in the lungs?

Gas at a constant temperature means the pressure and volume are inversely perpetrate

Which way will air move when pressure decreases in the lungs, in our out of the lungs?

Into the lungs

Which way will the air move when pressure increases in the lungs in or out of the lungs?

Out of the lungs

What muscle are needed for normal inspiration? what about forces inspiration?

The diaphragm and the intercoatals

What muscles are needed for normal expiration? what about forced expiration?

The active ones, Intercoastals and abdominal muscles

Why done we need muscles for normal expiration?

reduce chest cavity and expel air

What are TV, FVC1.0, and RV? be able to identify on the figure of lung volumes

TV = Tidal Volume
FVC = Forced Vital Capacity
RV = Residual Volume

How do you calculate Tidal Ventilation?

Divite minute ventilation by respiratory rate

How do you calculate alveolar ventilation

(tidal volume - dead space) x Respiratory rate.

What is the difference between tidal and alveolar ventilation? which number should be smaller? why?

Alveolar should be smaller, it excludes the volume of air that stays in conductive airways.

What information do we get from the FEV1.0 /FVC ratio? what would low ratio indicate?

Airflow obstrustion