Respiratory System

Question 1

inspiration

Answer 1

active process as energy is needed
intercostal muscles contract
ribs pulled up and out
diaphragm contracts and flattens
increases thorax volume and reduces pressure
external pressure greater air rushed to lungs

Question 2

expiration

Answer 2

passive process no energy is need
intercostal muscles relax
rubs pulled down and in
decreases thorax volume and increases pressure
external pressure low and air rushed out lungs

Question 3

pleural fluid

Answer 3

pleural membrane and cavity surrounding lungs and linking the thorax contains pleural fluid. fluid acts as lubricant allows friction free movement

Question 4

the alveolus

Answer 4

maximise diffusion of co2 and oxygen
have 
large surface area
thin walls
moist linking for dissolving gasses
network of capillaries 
Anti stick chemical called surfactant reduced surface tension when breaking out

Question 5

percentage

Answer 5

oxygen inhale 2 exhale 16
co2 inhale 0.04 exhale 4
nitrogen inhale 79 exhale 79
water vapour inhale variable exhale saturated

Question 6

process

Answer 6

oxygen used for respiration diffused from alveolus to blood. oxygen diffused from alveolus blood stream and capillaries. product co2 in respiration. carried in blood stream diffused from capillaries to alveolus we breath it out

Question 7

keeping lungs clesn

Answer 7

cilio are hail like structure along respiratory tube that more mucus up and out of lungs with dust
mucus traps dust bacteria and chemical that could damage lungs