What is the most fragile part of the body?

Could you elaborate on the most vulnerable aspect of the human body? Is it the delicate bones, the intricate nervous system, or perhaps the intricate organs that keep us alive? Each of these components plays a crucial role in our survival, but which one stands out as the most fragile and in need of protection? Understanding this aspect could lead to better preventative care and a deeper appreciation for the complexities of our bodies.