the exchange of gasses occurs in the airways of the lungs.
the exchange of gasses occurs in the airways of the lungs.
where does the exchange of gasses occur in the lungs?
airways
viruses may reach the lung by a number of different routes. respiratory syncytial virus is typically contracted when people touch contaminated objects and then they touch their eyes or nose. other viral infections occur when contaminated airborne droplets are inhaled through the mouth or nose. once in the upper airway, the viruses may make their way in the lungs, where they invade the cells lining the airways, alveoli, or lung parenchyma. some viruses such as measles and herpes simplex may reach the lungs via the blood. the invasion of the lungs may lead to varying degrees of cell death. when the immune system responds to the infection, even more lung damage may occur. primarily white blood cells, mainly mononuclear cells, generate the inflammation. as well as damaging the lungs, many viruses simultaneously affect other organs and thus disrupt other body functions. viruses also make the body more susceptible to bacterial infections; in this way, bacterial pneumonia can occur at the same time as viral pneumonia.
pneumonia
the lenuci horseshoe or the green horseshoe (, ; "lenuci" is also sometimes spelled "lenuzzi") is a u-shaped system of city squares with parks in downtown (donji grad) zagreb, croatia. the horseshoe was conceived in 1882 by croatian urbanist milan lenuci. the parks were designed between 1883 and 1887, at a time when today's donji grad formed the southern outskirts of zagreb. the construction was helped by the efforts to rebuild the city after the 1880 zagreb earthquake, and in 1889 the entire horseshoe was finished—its two ends were connected by the newly built zagreb botanical garden. the park system consists of seven squares aligned on three straight lines.
lenuci horseshoe