Pathogens

bacteria:

• no membrane bound organelles

• cell wall - peptidoglycan

• release toxins

viruses:

• non-living - no cellular structure

• consists of genetic material wrapped in a capsid

• attachment proteins to attach to host cell

fungi:

• eukaryotic

• saprotrophic - release enzymes and externally digest then absorb food

protoctista:

• eukaryotic

• act as pathogenic parasites

lysozyme destroys bacteria by digesting the bacterial cell wall

histamine is a chemical in the body that can cause blook vessels to dilate or constrict

cytokines are also chemicals that attract phagocytes