Cartilage between bones acts as a cushion and provide a smoother surface for joints to rub against. In oth â¦ er places it acts as a shaping structure. The tip of the nose and ears are composed almost entirely out of cartilage.
Story at-a-glance 1  -. Eating your boogers may help introduce pathogens from your environment to your immune system, helping it to learn and build defenses, according to a new theory in support of the hygiene hypothesis.
If you're looking for further evidence that booger eating may not be so bad after all, consider that it's the state of your immune system that determines your health after germ exposure. In one study, when 17 volunteers were infected with a flu virus, only half got sick.