Red blood cells can help, because when they are lysed (broken open) by pathogens, the haemoglobin in red blood cells releases free radicals which break down pathogen cell walls and membranes, killing them.
Neutrophils deal with defense against bacterial or fungal infection and other very small inflammatory processes and are usually first responders to microbial infection; their activity and death in large numbers forms pus. (they make up about 65% of human white blood cells)
How are red blood cells adapted to carry out their function? What is the importance of surface area to volume ratio of red blood cells?
Biconcave disc gives a large surface area to volume ratio
Higher surface area to volume ratio means oxygen binds quicker to the haemoglobin
How are white blood cells adapted to carry out their function?
Some are flexible, so that they can engulf (the process is technically know as phagocytosis) foreign objects, viruses, bacteria and fungal infections
Some can 'remember' dangerous infections, and therefore protect against them better the next time