Propiedades de los seres vivos

Páginas: 4 (808 palabras) Publicado: 8 de noviembre de 2010
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Elaborada por: M.C. José Francisco Rodríguez Zúñiga


Characteristics of Living Things

Defining a living thing is a difficult proposition, as is defining “life”—thatproperty possessed by living things. However, a living thing possesses certain properties that help define what life is.
Complex organization
Living things have a level of complexity and organizationnot found in lifeless objects. At its most fundamental level, a living thing is composed of one or more cells. These units, generally too small to be seen with the unaided eye, are organized intotissues. A tissue is a series of cells that accomplish a shared function. Tissues, in turn, form organs, such as the stomach and kidney. A number of organs working together compose an organ system. Anorganism is a complex series of various organ systems.
That level of organization occupy the organelles?


Living things exhibit a rapid turnover of chemical materials, which is referredto as metabolism. Metabolism involves exchanges of chemical matter with the external environment and extensive transformations of organic matter within the cells of a living organism. Metabolismgenerally involves the release or use of chemical energy. Nonliving things do not display metabolism.
How she is called the principal does it form of energy that the cells use?


Allliving things are able to respond to stimuli in the external environment. For example, living things respond to changes in light, heat, sound, and chemical and mechanical contact. To detect stimuli,organisms have means for receiving information, such as eyes, ears, and taste buds.
To respond effectively to changes in the environment, an organism must coordinate its responses. A system of nervesand a number of chemical regulators called hormones coordinate activities within an organism. The organism responds to the stimuli by means of a number of effectors, such as muscles and glands. Energy...
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