1 Retina: getting its name from the Latin meaning net, the retina is located at the back of the eye and is where light is detected... 2  more. 3  Trillion: 1,000,000,000,000. 4  Wavelength: a property of photons that determines their energy (how strong they are).We see photons of different wavelengths as different colors.
Emphysema. Emphysema is a long-term, progressive disease of the lungs that primarily causes shortness of breath. In people with emphysema the lung tissues necessary to support the physical shape and function of the lung are damaged.
Pulmonary emphysema is a chronic and lifelong disease of the lungs. Primarily, the alveoli (small and tiny air sacs) in the lungs are affected. Sometimes, they can be narrowed by the walls between them becoming thickened. Sometimes, these walls can be entirely destroyed, leading to larger yet fewer alveoli.arijuana use is also suspected as being related to the development of bullous emphysema. However other less common causes such as regular exposure to pollutants, consistent inhalation of dust and other contaminants, frequent and recurrent infections of the respiratory system and others may also exist.