Fenestra In histology, fenestrÃ¦ are small pores in endothelial cells that allow for rapid exchange of molecules between sinusoid blood vessels and surrounding tissue. These pores may enlarge and contract at the action of various stimuli such as noradrenaline.FenestrÃ¦ is a Latin word that means window.
Global Warming. An issue of major concern is the possible effect of the burning of fossil fuels and other contributers to the increase of carbon dioxide in the atmosphere. The action of carbon dioxide and other greenhouse gases in trapping infrared radiation is called the greenhouse effect. It may measurably increase the overall average temperature of the Earth, which could have disastrous consequences.
Credit: Karl Tate, LiveScience Infographic Artist. In this weekly series, LiveScience examines the psychology and sociology of opposite human behaviors and personality types. We all know them: The exuberant, outgoing glad-handers who relish a social gathering, and the reserved, shy wallflowers who might not attend the event at all. On a given day, of course, any one of us might want to throw a spontaneous party or have some quiet alone time.