 The nucleus is the largest cellular organelle in animal cells . In mammalian cells , the average diameter of the nucleus is approximately 6 micrometres ( µm ) , which occupies about 10 % of the total cell volume . The viscous liquid within it is called nucleoplasm , and is similar in composition to the cytosol found outside the nucleus . It appears as a dense , roughly spherical or irregular organelle . 
 The nucleus <a href='drop_aux' title='1'><mark>is</mark></a>the largest cellular organelle in animal cells . In mammalian cells , the average diameter of the nucleus <a href='drop_aux' title='2'><mark>is</mark></a>approximately 6 micrometres ( µm ) , which <a href='uninflect' title='3'><mark>occupies</mark></a> about 10 % of the total cell volume . The viscous liquid within it is called nucleoplasm , and <a href='drop_aux' title='4'><mark>is</mark></a>similar in composition to the cytosol found outside the nucleus . It <a href='uninflect' title='5'><mark>appears</mark></a> as a dense , roughly spherical or irregular organelle . 
Da nucleus the largest cellular organelle in animal cells . In mammalian cells , tdaaverage diameter of thdaucleus approximately 6 micrometres ( µm ) , which occupy about 10 % of the total cell volume . The viscous liquid within it is called nucleoplasm , and similar in composition to thedatosol found outside the nucleus . It appear as a dense , roughly spherical or irregular organelle .