A list of human body parts that experts believe are useless. Are they really useless? Or perhaps the experts haven’t yet truly discovered their true functions.
A few years back, I was bothered by a stomach pain that required medical attention. I was diagnosed as having an acute appendicitis that needed an urgent operation. Since school classes had just started, my father asked the doctor if they could postpone the operation. But the doctors are too apprehensive, and said, “the healing process will only requires just a week, besides appendix is a useless organ”. Shocked and surprised to hear those statements, I begun questioning my self, “are there really are useless body parts?”
Now, I’ve done some researched and found out that experts believed there are at least 10 body parts that are useless. Before you continue reading the rest of the article, I will leave you a puzzling question: do you agree with the experts findings or you have a dissenting opinion. It is your call. Here is the list:
Yes, you have a third eyelid and it is called the plica semilunaris. It is a small fold of bulbar conjunctiva located on the inner corner of the eye. An accessory organ of the eye, plica semilunaris is a left over from what’s known as a “nictitating membrane.” For most mammals, it is a vestigal organ, which is still present in chickens, lizards and sharks. But for humans, plica semilunaris serves an important purpose: it produces a fatty substance (rheum) that collects foreign bodies such as dirt and dust from entering the eye and damaging the cornea. This foreign bodies is then deposited hear the tear duct, ready to be brushed away in the morning.
Three million years ago, human were once hairier. Earth temperature at that time was much colder than today so our body hair is a good insulation for the colder climate. But by the time Homo erectus arrived, the ability to sweat meant we could shed our woolly ways. Today, having much body hair is annoying that people having this predicament seek the help of dermatologists. Thanks to the now popular hair waxing, excess body hair are remove with ease. So the question arises, “Do we really need body hair?”
Humans have four pairs of sinuses that are found in the bones of the head and face. These air-filled spaces are lined with a moist, thin layer of tissue called a mucous membrane. The mucous membrane secretes mucus that traps dust and germs that are in the air we breathe. Doctors don’t really know much about sinuses but some researchers think they keep the head from being too heavy. Sinuses also give you the pitch and tone of our voice.