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.
Gas exchanges occur by simple diffusion through the  respiratory membrane -- oxygen passing from the alveolar air into  the capillary blood and carbon dioxide leaving the bl â¦ ood to enter  the gas-filled aveoli.