mechanics of breathing (2)

Question 1

during inspiration does the diaphragm contract or relax

Answer 1

contract

Question 2

during inspiration do the intercostal muscles contract or relax

Answer 2

contract

Question 3

what is the role of the intercostal muscles during inspiration

Answer 3

to lift the ribs upwards and outwards

Question 4

what happens to the chest cavity during inspiration

Answer 4

it increases in size, which increases the volume

Question 5

what shape does the diaphragm go to during expiration

Answer 5

dome shape (relaxation)

Question 6

what happens to the chest volume and pressure of air during expiration

Answer 6

the chest volume decreases and air pressure in lungs increases

Question 7

definite inspiration/inhalation

Answer 7

the intake of air into the lungs, caused by increasing volume of chest cavity

Question 8

define expiration/exhalation

Answer 8

the expulsion of air from the lungs, caused by reducing volume of the chest cavity

Question 9

what two muscles do both inhalation and exhalation use

Answer 9

the diaphragm and intercostal muscles