TASK. Copy & finish the text.
When you inhale the diaphragm muscle contracts / relaxes .
This pulls the diaphragm upwards / downwards
. The intercostals relax / contract
and pull the ribcage upwards / downwards
. This increases / decreases
the volume inside your rib cage. The air now rushes into / out of
the lungs. This happens because the air pressure in the lungs is lower / higher
than the air pressure outside the body.
DONE ? Study 1.3 Like a pair of bellows