Inspiration and Expiration

Question 1

What two components can movements be divided into?

Answer 1

Bucket handle movement- transverse diameter increases

Pump handle movement- the anterior end of the ribs move upwards and outwards causing an increase on AP movement of the chest.

Question 2

What happens during inspiration?

Answer 2

Diaphragm contracts and moves downwards. Intercostal muscles contract moving rib cage upwards and outwards by increasing volume in chest cavity, pressure lowers and air rushes in.
Accessory muscles used: sternocleidomastoid, traps and scaleni.

Question 3

What happens during expiration?

Answer 3

Diaphragm relaxes and moves upwards.
Intercostal muscles relax and move inwards, there is a decrease in volume in the chest cavity, pressure increases and air rushes out.

Question 4

Is inspiration and expiration active or passive?

Answer 4

inspiration = active
expiration = passive

Question 5

During inspiration, what diameters increase symmetrically?

Answer 5

anteroposterior
transverse
vertical

Question 6

What is an increase in vertical diameter achieved by?

Answer 6

the diaphragm, causing abdominal contents to descend.