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exchange surfaces
parts of an organism over which they exchange substances with their enviroment
villi
-small intestine
-help absorb nutrients eg glucose + amino acids
alveoli
-lungs
-exchange o2 and co2
features of exchange surfaces
-large SA
-thib surfaces
-permeable surfaces for substances that they need
-good supply of external medium
how aveoli are adapted
-one cell thick walls
-moist walls
-very large surface areas
RIGHT SIDE OF HEART
vena cava
right atrium
right ventricle
pulmonary artery
LEFT HAND SIDE
Pulmanory vein
left atrium'
left ventricle
aorta
arteries
carry blood AWAY
-pumps blood at high pressure
-thick tissue around lumen
capillaries
-exchanges nutrients and oxygen with tissue (aveoli/villi)
-thin permeable walls
-low blood pressure
veins
-carrys blood TOWARDS heart
-thin walls and wide lumen
-low pressure blood
-valves=prevent back flow
celluar respiration
the process of releasing energy from glucose-contasntly happening in every living cell
aerobic
-plenty enough o2
-best way to repsire
anaerobic
-without o2
-least efficent
-only when WE HAVE TO
cons of anaerobic
-releases much less energy
-glucose is partially broken down
-lactic acid builds up =leads to cramps
anaerobic in plants
glucose→ ethanol + co2
Note 
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