Body Systems of Humans, Crayfish, Pigs, and Earthworms
Body Systems of Various Organisms All organisms in the world have a range of systems and organs in their body. Some organisms may share similar body systems while others have absolutely nothing in common. Several of those organisms include humans, pigs, crayfish, and earthworms. From their mushy, gushy organs to their soft, gentle skin, you may think, “How are humans and pigs possibly alike? Or a crayfish and an earthworm?” In many ways they may not be, but in other ways, they are very much alike. The body systems that will be compared and contrasted of these organisms are the nervous, circulatory, reproductive, muscular, integumentary, digestive, excretory, and skeletal systems. The anatomy of a human is very complex with many body systems and organs. Those systems and organs help our body function and carry out everyday activities. Our brain, spinal cord, peripheral nerves, and basic nerves help collect, transfer, and process information with the help of the nervous system. It helps command our body’s motor functions, the way that we move, and response to stimuli. Compared to a human, pigs have the same type of nervous system with the same parts and the same functions. As for a crayfish’s nervous system, it is composed of a ventral nerve cord fused with segmental ganglia, sup esophageal, and sub esophageal ganglia. The sup esophageal and sub esophageal ganglia control the head appendages in response to the sensory input received from receptors. An earthworm also has the same type nervous system as a human, just like a pig. As for the circulatory system, a human’s pumps blood to and from the body and lungs with the help of the heart, blood vessels, and arteries. A pig, however, has a heart, blood, blood vessels, lungs, and a circulatory mechanism. The heart, blood, blood vessels, and lungs have the same functions and structures as humans but the circulatory mechanism’s function is quite unique. Its circulatory mechanism circulates blood between the heart and
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