Natural Recovery

1.2. Cell types.

The most primitive cells are called prokaryotes and is dispersed therein the cytoplasm. Bacteria are unicellular prokaryotes. All other living things are composed of eukaryotic cells and evolved over complajas; in them the nucleus is well differentiated.

Eukaryotic organisms, in turn, may include:

· Unicellular organisms such as some fungi, some algae and protozoa.

· Celled organisms such as animals, plants, some fungi and some algae.

Not all eukaryotic cells are equal. Plant Eukaryotic cells differ from animal eukaryotic cells because they present outside the cell membrane rigid cellulose wall that provides a high resistance, and also contains cloroplasatos, where photosynthesis takes place.

The cells of the same organism are not equal. This is because they specialize different jobs.

2.1. The autotrophic nutrition.

Plants, algae and some bacteria comprise the following steps:
· Incorporation of nutrient medium. Inorganic molecules are: water-absorbing mineral salts by roots, and carbon dioxide (co2) - chelae fed directly into plants through the leaves.

Production of organic matter. This process, called photosynthesis, takes place in chloroplasts of the plant cell, where a substance, chlorophyll, which captures energy from sunlight. Along with nutrients, this energy is used to produce organic matter such as glucose. As a result of the process of photosynthesis gives off oxygen (O2).

· Application of organic matter. All plant cells sencillasgeneradas molecules used in the process of photosynthesis to regenerate their structure, growth, and so on. But these simple molecules in cellular respiration, a process that provides all the energy the plant needs for the medium and perform their vital activity.

In cellular respiration, glucose is degraded in the presence of oxygen to produce H2O and CO2 energy.

· Disposal of waste substances (excretion).

-The importance of photosynthesis.

• In photosynthesis, plants produce oxygen during the day and consume a portion of that oxygen breathing performing day and night. As the amount of oxygen produced by photosynthesis is greater than the amount consumed in the respriración, there is enough oxygen for other living things in their environment can breathe.

· Plants purify the air by photosynthesis as convert large amounts of carbon dioxide into organic matter.

· The photosynthetic organisms are producers of organic matter in ecosystems; other living things that depend directly or indirectly from the organic matter are called deconsumidores.

Thus, in ecosystems the organic matteria produced in the process of photosynthesis passes from one living being to another, in what are called food chains.

2.2. Heterotrophic nutrition.

Living beings are heterotrophs feed those who need other living things because they have no capacity for photosynthesis. Thus incorporating organic molecules as nutrients (sugars, fats, proteins) that their metabolizing cells to regenerate structures, grow or reproduce, and energy obtenet ith cellular respiration

In heterotrophic playback will identify the following stages:

· Incorporation of organic matter the medium. Heterotrophic single-celled organisms capture the elements of the environment and the cover in a digestive vacuole.

In most animals, multicellular organisms need to be a digestive disharmonize transform the food eaten in simple molecules that can use your body's cells.

· Exchange of gases. In most animals, the respiratory system is responsible for capture the oxygen to assign the circulatory system and collects the carbon dioxide expelled outside. This process is called external reproduction.

· Transport. Absorbidosen nutrients pass into the gut circulatory system, which is responsible for carrying them to different cells.

· Utilization of organic matter (metabolism). The animal cells extracted from the liquid circulating nutrients: simple organic molecule, which comes from the absorption in the digestive-and-oxygen reaching the cells from the respiratory or from the gastric cavity-.Los organic nutrients are burned using oxygen during cellular respiration, and consequently generated waste products such as carbon dioxide and energy.

· Disposal of waste substances into the environment (excretion).