The endothelial cell is thought to arise from the splanchnopleuric mesoderm. Endothelial cells form the inner lining of a blood vessel and provides an anticoagulant barrier between the vessel wall and blood.In addition to its role as a selective permeability barrier, the endothelial cell is a unique multifunctional cell with critical basal and inducible metabolic and synthetic functions.ell facts: (1) Endothelium consists of approximately (1-6) x 10(13) endothelial cells forming an almost 1 kg organ. (2) They uniquely contain Weibel-Palade bodies, 0.1 microm wide, 3 microm long membrane-bound structures that represent the storage organelle for von Willebrand factor (vWF).
There are also temperature scales in which zero is absolute zero, the lowest possible temperature. (People have gotten close to absolute zero, but have never reached it. According to theory, we never will.) Absolute zero is at -273.15 Celsius, or -459.67 Fahrenheit. The Kelvin temperature scale uses the same size degree as Celsius, but has its zero set to absolute zero. To convert from Celsius to Kelvin, add 273.15 to the Celsius reading. The Rankine temperature scale uses the same size degree as Fahrenheit, but has its zero set to absolute zero. To convert from Fahrenheit to Rankine, add 459.67 to the Fahrenheit reading.
Absolute zero is the absolute coldest temperature that could theoretically exist. At absolute zero, entropy is minimized. The temperature scale Kelvin's zero point is absolute zero.