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The diagram below represents human foetus in a uterus.
BioF4T1P2q3

  1. Name the part labeled S. 
  2.    
    • Name the types of blood vessels found in the structure labeled Q. 
    • State the differences in composition of blood in the vessels named in (b)(i) above 
  3. Name two features that enable the structure labeled P carry out its function. 
  4. State the role of the part labeled R. 

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  1. chorion
  2.   
    • umbilical vein; umbilical artery
    • More food nutrients and more oxygen in veins;; less food nutrients more excretory   products in the arteries.
  3.    
    • Highly vascularised/large surface area
    • Presence of secretory cells;
  4. cushions/absorbs shock
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