Surfactant: A fluid secreted by the cells of the alveoli (the tiny air sacs in the lungs) that serves to reduce the surface tension of pulmonary fluids; surfactant contributes to the elastic properties of pulmonary tissue, preventing the alveoli from collapsing.urfactant: A fluid secreted by the cells of the alveoli (the tiny air sacs in the lungs) that serves to reduce the surface tension of pulmonary fluids; surfactant contributes to the elastic properties of pulmonary tissue, preventing the alveoli from collapsing.
Guy Fawkes' Day is not a public holiday. Businesses, organizations and schools are open as usual. Public transport services run to their normal timetables. Some organizations, communities and municipalities may organize public bonfires or displays of fireworks on or around November 5.
Some people give their bosses cards, gift certificates, or flowers on Bossâs Day. This observance is becoming increasingly popular in various workplaces. It has received both praise and controversy. Bossâs Day, which is on October 16, is an observance and it is not a nationwide public holiday in the United States. If it falls on a weekend, then it is celebrated on the working day closest to it.