how many red blood cells are in a human body?
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One single drop of blood contains around a million erythrocytes, or Red Blood Cells \n and FYI, the average life span of a Red blood cell is 120 days!!!
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White blood cell count (WBC). The number of white blood cells in a volume of blood. Normal range varies slightly between 4,300 and 10,800 cells per cubic millimeter (cmm). This can also be referred to as the leukocyte count and can be expressed in international units as 4.3 - 10.8 x 109 cells per liter. Leukopenia is present when the count falls less than 1000/mm3, the risk of infection increases drastically. LEUKOPENIA IS NEVER NORMAL, can be caused by radiation, anaphylactic shock, systemic lupus erythematosus, and certain chemotherapeutic agents.
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The human body, consists of an estimated 20 to 30 trillion cells.
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Men typically have more muscle mass than females.  These muscles consume a lot of oxygen, which is carried by red blood cells.  More oxygen requirements = more red blood cells.
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Normal male cells have 23 pairs of chromosomes (1-22 & X+Y) or 46 total chromosomes.
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In an average healthy adult, the volume of blood is about one-eleventh of the body weight. Most sources state the volume of blood in an average human adult, who is between 150 to 160 pounds, as between 4.7 and 5 liters, although the more recent sources state the volume of blood in an average adult as 4.7 liters. Sources state that an 80-pound child had about half that amount, and an 8-pound infant has about 8.5 ounces.In an average healthy adult, the volume of blood is about one-eleventh of the body weight. Most sources state the volume of blood in an average human adult, who is between 150 to 160 pounds, as between 4.7 and 5 liters, although the more recent sources state the volume of blood in an average adult as 4.7 liters. Sources state that an 80-pound child had about half that amount, and an 8-pound infant has about 8.5 ounces.
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Some cells don't regenerate ever (nerve cells).  Some cells are constantly regenerating (red blood cells).  Red blood cells only have a lifespan of a week.
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It has approximately 6 quarts (or 5.6 liters) of blood.3\n\nsome quick facts for you to chew on.\n\nIn one day, your blood travels nearly 12,000 miles. \nYour heart beats around 35 million times per year. \nYour heart pumps a million barrels of blood during the average lifetime -- enough to fill three supertankers.
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Hct is the proportion of blood volume that is occupied by red blood cells.  Conditions that raise it may be a chronic state of hypoxia, where the body grows more rbc's, such as high altitude, and lung problems, even sever dehydration.  Lower hct is typically anemia or bloodloss.
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The human spleen is an organ that creates lymphocytes for the destruction and recycling of old red-blood cells. The spleen is also a blood reservoir. It supplies the body with blood in emergencies such as a bad cut. The speen is also the location where white blood cells trap organisms.
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4000 to 11000 is the normal range or count of a human being's white blood cells in a cubic centimeter of blood. Below 4000 is probably bone marrow defect and more than 11000 is probably infection or leukaemia
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Blood is about 7% of the human body weight , so the average adult will have about  5 liters of blood of which 2.7-3 liters is plasma.\n\n\nAddition  1 liters is 2.11337 pint
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After birth, red bone marrow (myeloid tissue) in long bones is responsible for hematopoiesis, which is the process by which blood cells are formed. Hemocytoblasts are the stem cells that give rise to the five types of blood cells.  Proerythroblasts eventually become reticulocytes, and then erythrocytes (red blood cells)within a couple days after leaving the marrow; myeloblasts become neutrophils, eosinophils, and basophils; monoblasts become monocytes; lymphoblasts become lymphocytes; and megakaryoblasts become thrombocytes (platelets), which are really just cell fragments.
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DEVIL is partially correct.  Red blood cells are used to transport oxygen.  They also carry carbon dioxide.  Red blood cells are like little delivery vehicles.  They pick up and deliver oxygen to where it's needed and return carbon dioxide to the lungs to be exhaled.
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White blood cell (leukocyte) count.
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A red blood cell. Haemoglobin is the red part of the blood within the cell
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There are 3 types of blood cells:- \nred blood cells \nwhite blood cells \nplatelets\n\nThese three types of blood cells are mostly manufactured in the bone marrow.\n\nRed blood cells (also called erythrocytes) are shaped like slightly indented, flattened disks. Red blood cells contain an iron-rich protein called hemoglobin. Blood gets its bright red color when hemoglobin in red blood cells picks up oxygen in the lungs.\n\nWhite blood cells (also called leukocytes) are a key part of the body's system for defending itself against infection. They can move in and out of the bloodstream to reach affected tissues. The blood contains far fewer white blood cells than red cells, although the body can increase production of white blood cells to fight infection. They fight germs such as bacteria and viruses and may also attempt to destroy cells that have become infected or have changed into cancer cells. \n\nPlatelets (also called thrombocytes) are tiny oval-shaped cells made in the bone marrow. They help in the clotting process.\n\nU asked what can happen when white blood cells are not enough.. 3 most known diseases:-\n\nNeutropenia -occurs when there aren't enough of a certain type of white blood cell to protect the body against bacterial infections. People who take certain chemotherapy drugs to treat cancer may develop neutropenia. \n\nHIV -a virus that attacks certain types of white blood cells (lymphocytes) that work to fight infection. Infection with the virus can result in AIDS leaving the body prone to infections and certain other diseases.\n\nLeukemia -cancer of the cells that produce white blood cells.\n\nIt is good if you can visit a pharmacist and get advise on the right supplement to take to balance the white blood cells in your blood. Every case/person is unique - so there's no 1 supplement that should work for every person with blood cell disorder.\n\nGood luck.