Gas exchange is the delivery of oxygen from the lungs to the bloodstream, and the elimination of carbon dioxide from the bloodstream to the lungs. It occurs in the lungs between the alveoli and a network of tiny blood vessels called capillaries, which are located in the walls of the alveoli.
Admitted for 180 days â Canadians admitted in âVisitor for Pleasureâ or B-2 status without a B-2 visa in hand are deemed to be admitted for 180 days under current US Customs and Border Protection (CBP) interpretation of the rules.
I read everywhere all Schengen type C visas have a maximum authorized stay of 90 days, if that is true I'd have no problem staying 60 more days and spending the holidays with my sister (Nov 11 to Jan 10) But my visa says DURATION OF STAY: 40.