one of a group of cells that develop in the walls of the seminiferous tubules. Spermatogenic cells include spermatogonia, spermatocytes, and spermatidsâall of which are transitional forms between primary sexual cells and spermatozoa.
long-haul optics. Long-haul optics refers to the transmission of visible light signals over optical fiber cable for great distances, especially without or with minimal use of repeaters. Normally, repeaters are necessary at intervals in a length of fiber optic cable to keep the signal quality from deteriorating to the point of non-usability. In long-haul optical systems, the goal is to minimize the number of repeaters per unit distance, and ideally, to render repeaters unnecessary.
High-Fiber Diet and Hemorrhoids. Hemorrhoids are a collection of small arteries and veins in the anal region. We are all born with a ring of hemorrhoids on the outside of the rectum and a ring just inside the rectum. Hard stools and straining cause hemorrhoids to enlarge, which can lead to bleeding and pain. In addition, hemorrhoidal tissue may protrude through the rectal opening (anal canal). A high-fiber diet results in a large, soft, bulky stool that passes through the colon easily and quickly. A softer, larger stool helps prevent straining, which can help avoid or relieve hemorrhoidal symptoms.