Breathing
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Give the steps for the bell jar demonstration
1) Pull the rubber sheet down (the diaphragm) 2) This increases the volume inside the bell jar and decreases the pressure inside 3) The drop in pressure causes air to into the balloons (inhaling) 4) let go of the rubber sheet - relaxing your diaphragm 5) Volume in the jar gets smaller - pressure increase so air rushes out
What happens when you breath in?
The diaphragm moves down, and the ribs move up - increases volume of chest cavity so the pressure decreases, and air is rushed in to fill the lungs
What happens when you breath out?
The diaphragm moves up and the ribs move down - pressure increases so air is rushed out.
What is lung volume?
Amount of air you can breathe into your lungs in a single breath
How is lung volume different for different people?
Taller people have a bigger lung volume than shorter people some diseases may reduce a person’s lung volume
How is lung volume measured?
using a spirometer
How is a spirometer used
a person breathes into the spirometer, through a tube, for a few minutes
What do you do after the volume of air that is breathed in and out is measured?
it’s plotted on a graph called a spirogram.