6th Grade · Science · Reading Passage · shared by Luke Morgan
Discover how the skin microbiome and helpful bacteria act as microscopic guards to protect the body in this free 6th Grade Science reading passage.
Microscopic Security Guards
Your skin is home to millions of tiny living things that you cannot see without a very powerful microscope. This collection of tiny organisms is known as the microbiome , and it helps keep your body healthy every day. One of the most common residents on your skin is a helpful bacterium called Staphylococcus epidermidis. While some bacteria can make you sick, this specific type usually acts like a loyal security guard. It spends its entire life living quietly on the surface of your skin to protect you from harm.
When you get a small scrape or a cut, your skin barrier is broken and becomes very vulnerable. This opening is like an unlocked door that invites harmful pathogens to crawl inside and cause a painful infection. These bad germs are constantly looking for ways to get past your skin and into your warm blood. Luckily, Staphylococcus epidermidis is already there on the scene to help defend the area around the new wound by fighting back against the intruders.
To fight off these invaders, the helpful bacteria produce special chemical weapons which are called antimicrobial peptides . You can think of these small molecules as tiny, natural antibiotics that the bacteria manufacture and release. When Staphylococcus epidermidis senses that dangerous germs are nearby, it begins to pump out these protective chemicals quickly. These peptides are specifically designed to target the cell membranes of the bad bacteria while leaving your cells alone to stay healthy and strong. It is a very precise and effective way to manage these microscopic threats.
The peptides work by attaching themselves to the outer layer of the harmful bacteria and creating small holes. Once the bad bacterium has holes in its shell, it can no longer stay alive or multiply. This…