PDF chapter test TRY NOW

Identify the missing part:  
Answer variants:
right atrium
aorta
renal artery
urethra
pulmonary vein
right ventricle
ureter
bladder
kidney
aorta
pulmonary artery
left atrium
What does 5 indicate in the picture?  
hh5.jpg
 
 
What does 5 indicate in the picture?   
es5.jpg