The Soviet Union duplicated its dual-launch feat with Vostok 5 and Vostok 6 (June 16, 1963). This time they launched the first woman (also the first civilian), Valentina Tereshkova, into space on Vostok 6. Launching a woman was reportedly Korolev's idea, and it was accomplished purely for propaganda value.
Lumen: A luminous term referring to the channel within a tube such as a blood vessel or to the cavity within a hollow organ such as the intestine. Lumen is a luminous term because it is Latin for light, including the light that comes through a window. When a hollow organ is cut across, you can see light through the space that has been opened. So the word lumen came to mean this space.
In biology, an organ or viscus is a collection of tissues joined in a structural unit to serve a common function. In anatomy, a viscus /ËvÉªskÉs/ is an internal organ, and viscera is the plural form. Organs are composed of main tissue, parenchyma, and sporadic tissues, stroma.The main tissue is that which is unique for the specific organ, such as the myocardium, the main tissue of the heart, while sporadic tissues include the nerves, blood vessels, and connective tissues.Functionally related organs often cooperate to form whole organ systems.n biology, an organ or viscus is a collection of tissues joined in a structural unit to serve a common function. In anatomy, a viscus /ËvÉªskÉs/ is an internal organ, and viscera is the plural form. Organs are composed of main tissue, parenchyma, and sporadic tissues, stroma.