Essay on Organism Physiology

798 WordsFeb 16, 20124 Pages
Organism Physiology The course in which different kinds of living organisms are thought to have developed from earlier forms during the history of the earth is defined as Evolution. Many time organisms evolve due to environmental changes. To better understand evolution this paper will review a diagram of an organism and explain how the organism has evolved physiologically to become suited to fit its environment. Organism To understand the evolution of an organism it is important to understand facts about the organism. The diagram illustrated below is a jellyfish. Jellyfish are located in the Artic Sea, the North Atlantic and Northern Pacific Ocean. Jellyfish can grow as large as 120 feet long. Some jellyfish has immortal properties and…show more content…
This makes them rather inedible; however many creature do pray on them. Jellyfish do not have specialized osmoregulatory, respiratory, digestive or circulatory systems. They digest using the gastrovascular cavity; this is where nutrients are absorbed. Since their skin is thin the body is oxygenated by diffusion and eliminates the need for a respiratory system. Since Jellyfish are made of 90% water; most of their umbrella mass is gelatinous material. This jelly type material is called mesoglea; which is surrounded by two lawyers of epithelial calls. This forms the exumbrella, top surface, and the subunbrella, bottom surface, of the body. The jellyfish do not have brains but instead they are made up of a network of loose nerves known as nerve net. The nerve net is located in the epidermis. Jellyfish detect their stimuli by this nerve net. Once detected the nerve net sends impulses throughout both the nerve net and throughout the circular nerve ring located at the rim of the jellyfish’s body. Physiological Evolution of Jellyfish One way scientist can determine the evolution of an animal is by studying the fossils of that particular animal. By studying these fossils they can determine the changes over that particular time period. Since the jellyfish are such unique animal’s scientist have very little information pertaining to their evolution. This is in part because of the limited amount of jellyfish fossils that are
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