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    Villus in Small intestine

The small intestine absorbs nutrients into the blood via large numbers of villi.
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Structure of a Villus
 
A villus is made up of a lacteal and a blood capillary.
 
1.  Lacteal                                        2.  Blood capillary
   Absorbs fatty acids & glycerol               Absorbs glucose & amino acids


 

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Lungs & Alveoli

The lungs are the organs of gas exchange via high numbers of alveoli.
















Gas Exchange:

Oxygen diffuses IN via nose/mouth from alveoli        lungs.  
 
Carbon dioxide in the  blood capillaries       alveoli & diffuses OUT via the nose/mouth.
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Alveolus & Blood Capillary 
 
At the start in the blood capillary  there is high CO2 & low O2

At the end there is HIGH O2 & low CO2 in the blood capillary.



 

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Features of Increased Absorption

Be careful on questions asking for structural features  DO NOT say  high numbers of villi/alveoli as this is not a STRUCTURAL feature:  Be careful!
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