History of the USS San Francisco. The USS San Francisco is a Los Angeles Class nuclear submarine and had a billion dollar price tag when it was built in the 1970s. Los Angeles class submarines were built from 1976-1996, with 62 completed and 39 still in service today, one of which is the USS San Francisco. These submarines have an estimated maximum speed of 30-33 knots, although the exact speed is classified. The USS San Francisco has an operational depth of 650 feet.
Full Definition of WHITE BLOOD CELL. : any of the blood cells that are colorless, lack hemoglobin, contain a nucleus, and include the lymphocytes, monocytes, neutrophils, eosinophils, and basophils âcalled also leukocyte, white blood corpuscle, white cell.See white blood cell defined for English-language learners.ull Definition of WHITE BLOOD CELL. : any of the blood cells that are colorless, lack hemoglobin, contain a nucleus, and include the lymphocytes, monocytes, neutrophils, eosinophils, and basophils âcalled also leukocyte, white blood corpuscle, white cell. See white blood cell defined for English-language learners.
What is the purpose of white blood cells? White blood cells (WBC), sometimes re-ferred to as leukocytes, are produced by the immune system to help defend the body against infection. They are formed in the bone marrow and enter the blood for migration to key organs; such as the spleen or lymph nodes. These cells are bigger than red blood cells, and there are far fewer WBCs in the bloodstream. A high white blood cell count likely in-dicates that an infection is present somewhere in the body, whereas a low number might indicate that an infec-tion or disease has slowed the ability of the bone marrow to produce new white blood cells. Typically one cubic millimeter of blood contains about 10,000 white blood cells. There are several different types of white blood cells, which are identified in a CBC with differential blood test. What is the purpose of red blood cells? Red blood cells (RBC), often referred to as erythrocytes, are responsible for de-livering oxygen throughout the body. There are between 3.6 to 6.1 million in