Question

The diagram below represents human foetus in a uterus.

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. 

Answer 1

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