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What are the steps of gas exchange?

1.  Sequence of events that results in gas exchange. In terrestrial vertebrates it includes 3 steps: 1. Ventilation: Inspiration and expiration. 2. External respiration: Gas exchange between air (in lungs) and blood. Blood then transport Oxygen to the body tissue cells. 3. Internal respiration: Gas exchange between blood and tissue fluid.

What is the physiology of gas exchange?

In human physiology pulmonary gas exchange refers to the diffusion of oxygen from the gas phase in the lung alveoli, through the thin alveolar-capillary membrane, into solution in the pulmonary capillary blood, and of carbon dioxide in the opposite direction, both driven by partial pressure gradients. blood gases.

Which occurs as part of gas exchange?

Gas exchange is a process that occurs as part of respiration, allowing an organism to exchange waste gases for gases it needs in order to function. In the case of humans and other mammals, this allows for the expression of carbon dioxide and the intake of oxygen.

What affects gas exchange in the lungs?

The lungs normally have a very large surface area for gas exchange due to the alveoli. Diseases such as emphysema lead to destruction of alveoli, with formation of larger bullae. This reduces the surface area available and slows the rate of gas exchange.


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