How does the blood fight against viruses?

• white blood cells carry antibodies which fight infections

Platelets help your body repair itself when you get hurt. They cause your blood to clot so that you stop bleeding when you get a cut and If you had no platelets you would bleed to death if you got a cut or scraped your knee if you didn't have them you would die bleeding or get infected and die. platelets work with the white blood cells to keep you healthy they are what form scabs.