Definition. A fibroblast is a cell that manufactures and maintains connective tissue, the structural framework that supports the organs of all animals. Fibroblasts secrete fibrous proteins and ground substance, which together form the extracellular matrix that is the basis of connective tissue. fibroblast is a cell that manufactures and maintains connective tissue, the structural framework that supports the organs of all animals.
Therefore, there is very little chlorophyll in these tropical waters, keeping them clear. (As an aside, corals are symbioses where phytoplankton have evolved to survive in nutrient-poor tropical waters by living inside the bodies of the corals and obtaining nutrients directly from the waste products of the corals.
Thus, when people talk about white and clear sperm they almost always pertain to the white and clear semen quality. Clear sperm (semen) is usually seen as a pre-ejaculate fluid or pre-cum. It is the fluid that will get out of male sexual organâs urinary meatus before climax in sex or during foreplay. White sperm is usually the sperm quality seen in the actual ejaculated fluid.