Human semen consists of two components: fluid and sperm cells. The fluid contains nutrients and other substances that preserve sperm cells and help fertilization. The sperm cells need to travel quite a distance to fertilize an egg after they are released into the female organs. The sperms have a tail - flagellum that is used to propel them. In young healthy individuals most sperm cells are active and healthy looking, but with age and some diseases the proportion of healthy mobile sperms drops. This affects reproductive ability of the individual. The videos show human semen examined in a laboratory microscopoe using regular light, phase contrast and dark field. Magnifications 400x - 600x. Different light is required to see cells without dyes, as live cells cannot be stained. The same technique can be used for other fresh human fluids, such as blood. There is 50/50 split of mobile and immobile sperm cells in this sample.
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