The Maryland Society for Promoting the Abolition of Slavery and the Relief of Free Negroes and Others Unlawfully Held in Bondage was founded in 1789, the same year the former colonies replaced their Articles of Confederation with the new Constitution, âin order to form a more perfect union.â.
In humans and other mammals, respiratory gas exchange or ventilation is carried out by mechanisms of the lungs. The actual exchange of gases occurs in the alveoli. Note: The above text is excerpted from the Wikipedia article Gas exchange, which has been released under the GNU Free Documentation License.
Introductionâ¢ Oxygen and carbon dioxide diffuse between the alveoli and pulmonary capillaries in the lungs, andbetween the systemic capillaries and cells throughout the body.â¢ The diffusion of these gases, moving in opposite directions, is called gas exchange.Page 2. External respiration occurs within the lungs, as carbon dioxide diffuses from the pulmonary. capillaries into the alveoli, and oxygen diffuses from the alveoli into the pulmonary. capillaries. â¢ Oxygen-rich blood leaves the lungs and is transported through the pulmonary veins to the. left side of the heart.