Breathing in humand

Question 1

What does ventiliation (breathing in) does?

Answer 1

= fresh air from the atmosphere to the alveoli
= increases concentration of o2 in alveoli
= decreases concentration of co2
= increases concentration gradient
=

Question 2

What muscles are involved in ventalation?

Answer 2

= diagphram
= intercostal muscles (between ribs)

Question 3

Which intercostal muscles are involved in what type of breathing?

Answer 3

= external: normal breathing
= internal: heavier breathing

Question 4

WHat happens when we breathe in?

Answer 4

= external intercostal muscles contract- pulls ribs upwards and outwards
= diapghram contracts causing it to flatten- increases volume, decreases pressure, the inside pressure is lower than the atmospherical pressure creating a gradient so moves in the lungs
air moves into alveoli and elastic fiberes stretch

Question 5

Why is inhalation active process?

Answer 5

= involves muscle contraction

Question 6

What happens when we breathe out?

Answer 6

= passive - muscle relaxes
= external intercostal muscles relax
= diagphram relaxes into dome shape
= reduces volume, this increases the pressure, so it is higher than the atmospherical pressure and air moves out of the lungs
= elastic fibres recoil to help push the air out

Question 7

What are the lungs surrounded by?

Answer 7

= plural membranes
= between is plural fluid
= acts as a lubricant as the lung volume changes