Now let's discuss some of the different types of physical anatomical barriers that exist inside our body that are part of the innate immune system and which basically function not to only prevent the physical movement of these pathogens into. Our body, but to also create an inhospitable environment to prevent the growth of different type of pathogens on our body and in our body. So let's begin with our skin. So, as we know, our skin consists of several layers and these different types of layers create an impermeable membrane that prevents the physical movement of pathogens into our body. On top of that, our skin also contains glands which secrete fatty acids. And when we create a layer of fatty acid on our skin we essentially create an inhospitable environment on which most bacteria cannot actually grow on and live on.