Hydrochloric acid (HCI) is a clear, highly corrosive liquid which is released in our stomach once we start consuming any food or drinks. The main role of HCI and other gastric juices is to break down the food we eat and cause the release of enzymes that further aid digestion. However, HCI has another important function; it protects our body from illness by destroying pathogens that are commonly found in foods. This ensures that we are protected from the food poisoning caused by salmonella and other harmful bacteria.
The human’s nose contains small hairs called cilia, that are only seen with a microscope. These hairs protect our respiratory system in many ways; firstly, nasal hairs keep out most of the dust and larger microorganisms from entering the nasal cavity, then sticky mucus and cilia works together by trapping and removing any dust or pathogens from the air as it flows …show more content…
It is made up of two layers; an outer layer known as epidermis and layer below called dermis. The epidermis is considered as more protective layer as it’s thicker, whilst dermis contains collagen and fibre, also upholding a network of blood vessels, hair roots, glands and extensions of the inner nervous system. In addition, on the outer layer there’s an outermost covering named stratum corneum. This layer is made of large plates of protein, known as keratin, and dead skin cells. Our skin is responsible of protecting the body form many external forces, by acting as a barrier. It covers our whole body and defends us against any bacteria and other agents of infection (toxins, harmful liquids and gases), most of which are unable to enter the skin and infiltrate the organs below; they are caught on its surface. Skin also provides a protection form mechanical impacts and pressure, variations in temperature, dehydration and