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Depence on Computers

  • Date Submitted: 01/25/2011 06:07 AM
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What is respiration?
In physiology, respiration (often mistaken with breathing) is defined as the transport of oxygen from the outside air to the cells within tissues, and the transport of carbon dioxide in the opposite direction. This is in contrast to the biochemical definition of respiration, which refers to cellular respiration: the metabolic process by which an organism obtains energy by reacting oxygen with glucose to give water, carbon dioxide and ATP (energy). Although physiologic respiration is necessary to sustain cellular respiration and thus life in animals, the processes are distinct: cellular respiration takes place in individual cells of the animal, while physiologic respiration concerns the bulk flow and transport of metabolites between the organism and the external environment.
How does respiration carry out?
 Air-breathing vertebrates such as humans, respiration of oxygen includes four stages:
  * Ventilation, moving of the ambient air into and out of the alveoli of the lungs.
  * Pulmonary gas exchange, exchange of gases between the alveoli and the pulmonary capillaries.
  * Gas transport, movement of gases within the pulmonary capillaries through the circulation to the peripheral capillaries in the organs, and then a movement of gases back to the lungs along the same circulatory route.
Organ | Oxygen consumption
(ml O2/min per 100g)[1] |
Heart (rest) | 8 |
Heart (heavy exercise) | 70 |
Brain | 3 |
Kidney | 5 |
Skin | 0.2 |
Resting skeletal muscle | 1 |
Contracting skeletal muscle | 50 |
  * Peripheral gas exchange, exchange of gases between the tissue capillaries and the tissues or organs, impacting the cells composing these andmitochondria within the cells.

What is the use of respiration?
Respiratory behavior is correlated to the cardiovascular behavior to control the gaseous exchange between cells and blood. Both behaviors are intensified by exercise of the body. However, respiratory is highly voluntary compared...


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