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Diffusion
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Diffusion, Active transport & osmosis
works best when:-
LARGE SURFACE AREA ­ LOTS OF
SUBSTANCES
THIN CELLS MEMBRANE ­ SHORT
DISTANCE
MOIST - FASTER
RICH BLOOD SUPPLY ­ IN AND OUT
QUICKLY
VENTILATED ­ AIR MOVES IN AD OUT 3…read more

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Respiration system
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Slide 5

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Respiratory System
Inhaling Exhaling
RIBS ­ up and outwards RIBS ­ in and outwards
THE DIAPHRAGM ­ goes THE DIAPHRAGM ­ relax
down THE CHEST VOLUME-
THE CHEST VOLUME- decrease
increases PRESSURE INSIDE ­
PRESSURE INSIDE ­ increase
decreases THE LINGS ­ decrease
THE LINGS ­ expand
AIR RUSHES - out
AIR RUSHES - in
5…read more

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Ventilators Machines that move air in/out of lungs
`IRON LUNGS'
· Air pumped out of case }Could interfere
· Pressure dropped
· Lungs expand so air is drawn into lungs with blood flow
· Air pumped into case
to lower body
· Forces air out of lungs
MODERN VENTILATORS
· Pumps air into lungs }damage or burst
· Expand the ribcage alveoli 6
· Stoop pumping air = ribcage relaxes + pushes air back out of lungs…read more

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