1.2 Mechanics Of Breathing

Question 1

What muscles are used during inspiration when body’s at rest

Answer 1

Diaphragm and external intercostals

Question 2

What muscles are used during expiration when the body’s at rest

Answer 2

Diaphragm and external intercostals relax

Question 3

What muscles are used in inspiration during exercise

Answer 3

Diaphragm 
External intercoastals 
Sternocleidomastoid
Scalenes 
Pectoralis minor

Question 4

What muscles are used during exercise in expiration

Answer 4

Internal intercostals

Abdominals

Question 5

What happens to ribs and diaphragm when air is inspired

Answer 5

Ribacge moves up and out

Diaphragm contracts is goes flat

Question 6

What happens to ribcage and diaphragm when air is forced out

Answer 6

Ribcage falls

Diaphragm relaxes and rises to dome shaped position

Question 7

How is air taken in and sent to the lungs

Answer 7

Nose
Through pharynx and onto larynx
Then down trachea and into the right and left bronchus
These subdivide into secondary bronchi
These then get thinner and branch into bronchioles which lead to the alveoli