Breathing In Flashcards
The breathing-in process causes the volume in the chest to ………..and the air pressure in the lungs to …………………………..
As a result, air moves
increase
decrease till just lower than atmospheric pressure
down the pressure gradient and rushes into the lungs
Mechanism when at rest what does then diaphragm do
and what is the diaphragm
The diaphragm(sheet of muscle that separates the thorax and abdomen) contracts and flattens, increasing chest volume
Mechanism when exercising
In addition to the flattening of the diaphragm the external intercostal muscles contract, causing the ribcage to move upwards and outwards
what are external intercostals
muscles which lie below ribs
What happens to the volume and pressure bin thorax in inspiration
and what is the thorax
made up of a ribcage, which houses the lungs and heart
volume increases
pressure inside decrases
what does the rib cage do
move out
