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Sunday, February 19, 2012

The Organizing Pattern of the Bodies of Living Organisms

Every living cell performs a number of activities in it. Exchanging the materials efficiently through the surfaces is an inevitable activity. When a cell increases quantitatively the increased area is less than the amount of volume increased. Exchanging material through the surface of large cells are not sufficient to pursue the vital activities efficiently. Therefore when the growth comes up to a limit the cell divides. The multicellulars originate like this. Now you have already learn that cell division forms the tissues and tissues organize to form the body of multicellular organisms.

The systems in plants occur by uniting a few tissues. The examples are the system of xylem tissues and the system of phloem tissues. But in animals, the tissues unite and are organized as functional units. These functional units are identified as systems. The examples could be given as skin, eye, tongue, stomach for the systems in the body.

The life is the organization of vital activities performed by the organisms. There are systems formed by uniting a number of organs to perform special activities in the bodies of organisms. The digestive system and the respiratory system are the example for this. An organism forms by uniting many systems.

The Necessity of Systems for the Activities of the Body

The organisms grow for their existence. They reproduce for the existence of their kind. They respire to earn the necessary energy to perform all the vital activities including growth and reproduction. The raw materials are supplied by nutrients. The excretory substances are produced while doing the activities. The organisms excrete some substances and for that they have the excretory systems. To do most of these activities organisms should move and respond stimuli. There is a struggle for existence among the organisms for a successful life.

The organisms succeed when they perform these vital activities efficiently and suitably to the environment. When an organism increase in size and complexity, the intake amount of material increases. So is the amount of material it excretes. Although the diffusion is an efficient method of exchanging materials in the unicellular organisms, it is not efficient for multicellulars. The flowing of particles from one place to another in the body along with a pressure difference is know as the Mass Flow.  It is an efficient method of exchanging materials in multicellular organisms. The mass flow occurs in the blood circulatory, respiratory and excretory systems. Through systems, the organisms perform their vital activities efficiently and survive successfully in the environment.

Summary
  • Systems pursue a diligent work to perform the vital activities efficiently in higher multicellular organisms.
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