Breathing

Question 1

During breathing what two planes do the ribs move in?

Answer 1

Forwards and backwards (anteroposterior) and laterally.

Question 2

During quiet breathing which muscle provides the most of the inspiratory force?

Answer 2

Diaphragm

Question 3

During forced breathing what muscles are used to bring large volumes of air into the lungs?

Answer 3

The accessory muscles are used in conjunction with the diaphragm and external intercostal muscles.

Question 4

What are the accessory muscles?

Answer 4

The sternocleidomastoids and the scalenes.

Question 5

During quiet breathing how is air released?

Answer 5

Expiration is entirely passive, relying on elastic recoil of the lungs and the weight of the rib cage to reduce the volume of the thorax and push air out of the lungs.

Question 6

During forced expiration what muscles are used?

Answer 6

Internal intercostals and abdominal muscles.