The Respiratory System

     Respiratory system and life is a united. They can not be separated. Plants, animals, and also human need this system in different ways. The respiratory system deliver oxigen to the circulation system for transport to all body. The respiratory and circulation system work together to deliver oxigen ang remove canbon ioxide in two phase process called respiration.

     The first phase of respiration begins with breathing in or inhalation. This inhalation brings air from outside body into the lung. Oxigen in the air moves from the lungs which pumps the oxigen-rich blood to all body. It is produces carbon dioxide as a byproduct.

     The second phase is carbon dioxide from the cells move to the bloodstream. The bloodstream carries carries carbon dioxide to heart, which pumps the carbon dioxide-laden blood to the lungs.

     In the lung, breathing out or exhalation removes carbon dioxides from the body, thus completing the respiration system.

Source : Look A Head 3 (By changes)

The Nuclear Energy

     Nuclear energy is commonly offered as an alternative to overcome the crisis of energy. Some people agree with the utilization of it because of its benefits. Some other, however, disagree because of its risk to environtment.

     Those who agree with the operation of nuclear reactors usually argue that nuclear energy is the only feasible choise to answer the increasing enrgy needs. The other sources of energy : oil, coal, and liquid natural gas are not renewable and safe, while nuclear energy can be sustainably when produced in a safe way.

     However, people who disagree with the use of nuclear energy point out that the waste of nuclear products can completely destroy the environment and human lives. A meltdown in a reactor can cause the serious contamination imperiled people and environment.

     It's obvious that nuclear energy should be avoided because it really endangers the environment but it causes a less polluted.

Source : Look A Head 3 ( By changing)