Mechanics of ventilation and respiratory volumes

Question 1

What is ventilation?

Answer 1

process of breathing

Question 2

What are the two phases of ventilation?

Answer 2

Inspiration (breathing in)

Expiration (breathing out)

Question 3

What do the two phases process bring about ?

Answer 3

Change in pressure within the lungs

Question 4

What does the diaphragm do?

Answer 4

Sheet of muscle that separates the thermotical cavity from the abdominal cavity
Only blood vessel and verves can pass through

Question 5

What do external intercostal muscles do?

Answer 5

Sit between the ribs on the outside of the ribs

Question 6

What happens when the diaphragm contracts?

Answer 6

Ferulic nerve is stimulated diaphragm contracts

Diaphragm flattens much more, more space in the cavity

Question 7

What happens when the external costal muscles pull ribs up and out?

Answer 7

Increase size of the thorastic cavity and will pull the lungs with it
Air pressure in the lungs will drop- causes pulling in of air from the external atmosphere

Question 8

Describe muscles of expiration

Answer 8

Message to the diaphragm to contract is stopped
back to original shape
The message from the intercostal nerves to the external intercoastal muscles will stop -ribs will go downwards and inwards

Question 9

What does decrease space in the lungs cause?

Answer 9

Increase alveoli pressure

Question 10

What do the intercostal muscles have to do when exercising?

Answer 10

need to bring them inwards and downwards quicker