what is respiration??

呼吸;一口氣;呼吸作用;

respiration:
the metabolic processes whereby certain organisms obtain energy from organic molecules; processes that take place in the cells and tissues during which energy is released and carbon dioxide is produced and absorbed by the blood to be transported to the lungs

Respiration is the process of exchanging oxygen and carbon dioxide between an organism and its external environment (breathing).There are several ways to dichotomize the physiology of respiration: *Aquatic respiration*Buccal pumping

The physical and chemical processes by which an organism supplies its cells and tissues with the oxygen needed for metabolism and relieves them of the carbon dioxide formed in energy-producing reactions. Any of various energy-yielding oxidative reactions in living matter.

Respiratory system

Among quadrupeds, the respiratory system generally includes tubes, such as the bronchi, used to carry air to the lungs, where gas exchange takes place. A diaphragm pulls air in and pushes it out. Respiratory systems of various types are found in a wide variety of organisms. Even trees have respiratory systems.

In humans and other mammals, the respiratory system consists of the airways, the lungs, and the respiratory muscles that mediate the movement of air into and out of the body. Within the alveolar system of the lungs, molecules of oxygen and carbon dioxide are passively exchanged, by diffusion, between the gaseous environment and the blood. Thus, the respiratory system facilitates oxygenation of the blood with a concomitant removal of carbon dioxide and other gaseous metabolic wastes from the circulation. The system also helps to maintain the acid-base balance of the body through the efficient removal of carbon dioxide from the blood.

Respiration:

The process by which organisms release chemical energy from food through the controlled oxidative breakdown of food

生物透過受控制的氧化分解作用，把食物中的化學能釋放出來的過程。

呼吸-breathe