Memory Anchor:

• Super Challenge:

  Stretch:

  Challenge:

Key Questions:

1. What part of the human body is the thorax?
   • The chest cavity from the diagram up is called the Thorax.
2. What is the function of the ribs?
   • The ribs form a stiff boundary to the thorax.
3. What parts of the body are needed to ventilate the lungs in breathing?
   • The rib cage, intercostal muscles and diaphragm are used to breathe.
4. What happens to increase the volume of the lungs?
   • To move air into the lungs the rib cage is moved out and up by the intercostal muscles contracting. The diaphragm contracts and sinks.
5. How does the increase in lung volume cause breathing in?
   • The increase in the volume of the lungs, reduces the air pressure in the lungs to lower than the air outside, pulling air Particles into the lungs..
6. What happens to decrease the volume of the lungs?
   • To move air out of the lungs the rib cage is moved in and down by the intercostal muscles relaxing. The diaphragm relaxes and rises.
7. How does the decrease in lung volume cause breathing out?
   • The decrease in the volume of the lungs, increases the air pressure in the lungs to lower than the air outside, pushing the air Particles out of the lungs.
8. How does air pressure make air particles move?
   • When there is a difference in pressure between the air around the nose and the air in the lungs, Particles will 'diffuse' from the area of high pressure the area of lower pressure.
9. How could you measure lung volume?
   • You could use lung volume bags to measure the air breathed out.