Question

the upper part of the heart
help to stop bleeding
carry oxygen to the cells and take carbon dioxide away
help the body fight infection
atria
ventricles
blood
platelets
plasma
carbon dioxide
red blood cells
white blood cells

Explanation:

The atria are the upper - part of the heart. Platelets help to stop bleeding. Red blood cells carry oxygen to the cells and take carbon dioxide away. White blood cells help the body fight infection.

Answer:

the upper part of the heart - atria
help to stop bleeding - platelets
carry oxygen to the cells and take carbon dioxide away - red blood cells
help the body fight infection - white blood cells