Rat and Human Comparison

An in depth comparison of rattus and homo sapien.

Rattus and Homo Sapien Comparison

            Rattus and Homosapiens have very similar internal anatomies.  Other than the fact that rat organs are much smaller than humans, there are still a few differences in their internal structures.

              Rattus and Homo sapiens are mammals, so they both have a four-chambered heart. Both rats and humans circulate their blood the same way.  The only difference in the circulatory systems of Rattus and Homo sapiens is the size.

               The gastrointestinal tract of Rattus and Homo sapiens is also similar.  However, instead of a gall bladder, rats have a bile duct. The bile duct is a tube-like structure that carries bile.  The bile is a body fluid that helps digest lipids. A gall bladder is an organ that isn’t necessary for life, but helps with digestion and contains bile produced in the liver.  Rattus does not have an appendix at the end of their caecum like Homo sapiensdo.  The caecum contains bacteria, which help break down plant materials in both rats and humans. The appendix is at the end of the human caecum and its use is not entirely clear. Some say it  protects bacteria that is needed for the colon to function. Another theory is that the appendix was used to break down bones that were accidently swallowed by early humans. 

               The respiratory system of Rattus and Homo sapiens are nearly exact except for size and minor differences.  They both use the respiratory system to exchange carbon dioxide and oxygen with the surrounding air. The two parts to the respiratory system are upper and lower tracts.  The upper respiratory tract contains the nasal passages, the larynx, and the pharynx.  The lower respiratory tract contains the lungs, trachea, and bronchi. In conclusion, Rattus and Homo sapiens have very similar internal organs with minor differences.

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