Pathogens and How They Make Us Ill
Pathogens are basically troublemaking microorganisms that sneak into your body and cause disease. Think of them as unwanted guests that trash your house! The main culprits are bacteria, viruses, protists, and fungi - each with their own sneaky ways of making you feel rubbish.
Bacteria are tiny living cells that love to reproduce rapidly inside your body. They make you ill by producing toxins that damage your cells and tissues - it's like they're poisoning you from the inside. Meanwhile, viruses are even smaller (about 1/100th the size of bacteria) and work differently by hijacking your cell's machinery to make copies of themselves until the cell literally bursts.
Protists are single-celled organisms that often act as parasites, whilst fungi penetrate plant and animal tissue to cause disease. These pathogens spread through water, air droplets, and direct contact - which is why washing your hands is so important!
Quick Tip: Remember that bacteria produce toxins, but viruses actually destroy cells by bursting them - this difference often comes up in exam questions!
