intercostal muscles contract
rib cage moves up and out
diaphragm contracts and flattens
thorax volume increases
pressure in thorax decreases
luings inflate and draw in air
8 of 18
what happens during expiration
intercostal muscles relax
diaphragm relaxes and moves up
thorax volume decreases
thorax pressure increases
air is pushed out of lung
9 of 18
How is the bell jar model acurate
same shape
iinflates and deflates
10 of 18
How is the bell jar model inacurate
rubber sheet inverts whereas diaphragm lies flat
bell jar doesnt move whereas ribs do
11 of 18
how does gas exchange happen
oxygen diffuses across the walls of the alveoli from air into the blood. CO2 diffuses across walls of alveoli from the blood into the air in the alvioli
12 of 18
How are alvioli adapted to suit their role
1 cell thick-short diffusion distance
moist lining- lets gas dissolve for diffusion
folded-larger surface area for diffusion
covered in cappilaries- maintains diffusion gradient
13 of 18
What are the differences between inspired and expired air
expired air has:
less oxygen
more CO2
more water vapour
14 of 18
How are the lungs kept clean
Mucas traps any dusyt and bacteria in the air. the mucas is then moved out of the lung with cilia hair cells into the back of the throat. You can then swallow or caugh up the mucas.
15 of 18
How does Tar afect the body when smoking
bronchitis- a chronic cough caused by mucas build up as tar paralyses cilia cells
cancer-hard to detect until avanced
emphysema-causes shortness of breath and constant cough
16 of 18
How does carbon monoxide affect the body
carried in red blood cells after smoking leaving you short of breath and possible amputation
17 of 18
How does nicotine affect the body
Nicotine is the addictive chemical in tobaco which causes people to continue smoking
18 of 18
Other cards in this set
Card 2
Front
What is the word and balanced symbol equation of aerobic respiration
Back
oxygen+glucose-Varbong dioxide+water+ATP
C6H12O6+6O2-6CO2+6H2O
Card 3
Front
What is anaerobic respiration and it's word equation
Back
Card 4
Front
What is an advantage of anaerobic respiration
Back
Card 5
Front
What are the dissadvantages of anaerobic respiration
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