Slow blood flow can occur if there is a narrowing of the blood vessel. This can obstruct the flow. One common cause is atherosclerosis. There are deposition of cholesterol or lipids in the wall of the arteries which can narrow it. Other causes can be an inflammation. In the veins there can be slow flow where there is difficulty in pumping blood from legs towards the heart. If you feel any symptom, you should get an examination you need to get it checked by doctor. Any query, please feel free to ask.
Retrovirus, any of a group of viruses that belong to the family Retroviridae and that characteristically carry their genetic blueprint in the form of ribonucleic acid (RNA).
Introduction to retroviruses. The family of Retroviruses are characterized by their ability to incorporate viral DNA into a host cell's genome. Most retroviruses like Rous sarcoma virus (RSV), infect dividing cells during mitosis, when the chromatin is exposed to the cytoplasm. Conversely, the genus of Lentiviruses, like the human immunodeficiency virus (HIV), have evolved in order to infect non-dividing cells.