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.
Before leading towards the causes, it is very much important to know what is global warming. Global warming, can be defined as an increase in the earthâs atmospheric, oceanic temperatures and an overall change in earthâs atmosphere including a rise in sea levels and variability of snow falls.Climate change and associated impacts vary from region to region around the globe.. Burning of Fossil Fuels. Each time a fossil fuel burn, carbon dioxide levels in the atmosphere increase. As we know carbon dioxide absorbs infra-red energy emitted from the earthâs surface, preventing it from returning to space.