it is called system because they are group they interact with each other to do the particular tasks. our system are interconnected with the ultimate purpose. human is a complex machine. can you imagine, if one part of this machine will malfunction,of course the whole are interconnected,certainly, if one part of this failed, the whole body will failed too. particularly, if the most vital organ will stop. indeed,it will lead to death.all organs are fundamental, but some organs are vestigial that the organism didn't need them sometimes they will lead to surgically in order to removed this. like appendix,it is a small tube that is attached to the large intestine,on the other hand this appendix is not as much vital organs, but in this generation, appendix can become infected resulting of appendicitis. and the only treatment is surgical removed, if this organ will not removed, the infection will spread and some lead to death......
