The blood going out from the arteries is full of oxgyen.It delievers that oxgyen to organs,therefore when it returns in the veins it contains carbon dioxide.
Answer:
The nucleus is the orange dot in the center of the blue thing
The blue thing is the cell body the myelin shelin is the yellow tube
Explanation:
I'm sorry thats all I know
Answer:
White blood cells kill pathogens when your skin becomes infected
