Breathing In

Question 1

The breathing-in process causes the volume in the chest to ………..and the air pressure in the lungs to …………………………..

As a result, air moves

Answer 1

increase

decrease till just lower than atmospheric pressure

down the pressure gradient and rushes into the lungs

Question 2

Mechanism when at rest what does then diaphragm do

and what is the diaphragm

Answer 2

The diaphragm(sheet of muscle that separates the thorax and abdomen) contracts and flattens, increasing chest volume

Question 3

Mechanism when exercising

Answer 3

In addition to the flattening of the diaphragm the external intercostal muscles contract, causing the ribcage to move upwards and outwards

Question 4

what are external intercostals

Answer 4

muscles which lie below ribs

Question 5

What happens to the volume and pressure bin thorax in inspiration

and what is the thorax

Answer 5

made up of a ribcage, which houses the lungs and heart

volume increases

pressure inside decrases

Question 6

what does the rib cage do

Answer 6

move out