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White blood cells are produced within the bones in a substance called bone marrow, according to the Health Encyclopedia of the University of Rochester Medical Center. White blood cells only account for around 1 percent of a human's blood.


White blood cells help fight infections in the body by attacking pathogens, such as bacteria and viruses, after they invade the bloodstream. Healthline states that these cells are formed in the bone marrow and circulate throughout the bloodstream to fight and attack pathogens.


Infections, leukemia and arthritis can cause too many white blood cells, according to Mayo Clinic. Certain medications and smoking can also cause this condition.


Low white blood cell counts may occur when patients have conditions that interfere with bone marrow functioning or conditions like cancer, viral infections and autoimmune disorders, according to Mayo Clinic. Severe infections may also cause the body to use more white blood cells than it can produce.


Red blood cells carry oxygen and nutrients to the tissues in the body and take away carbon dioxide. They are also called erythrocytes. They get their red color from a pigment called hemoglobin, and it is the hemoglobin that actually carries the oxygen and carbon dioxide.


White blood cells emerge from the bloodstream through capillaries and engage harmful molecules by either engulfing them or poisoning them. There are different types of white blood cells, which divide between them various infection-fighting activities, from detection to elimination.


Infections and inflammation usually cause high white blood cell counts, according to the American Association for Clinical Chemistry. The elevated count can be also be attributed to allergic responses, severe stress and pregnancy. Medications such as corticosteroids and epinephrine boost white blood


A high white blood cell count may indicate anemia, infection, allergic reaction or leukemia, states MedlinePlus. Other causes include extensive tissue damage, cigarette smoking and severe mental or physical stress. Taking certain medications, including albuterol, corticosteroids, lithium and epineph


An elevated red blood cell count is associated with dehydration, congenital heart disease, kidney tumors, bone marrow diseases and scarring of the lungs, reports MedlinePlus. Red blood cells contain hemoglobin, a protein that transports oxygen.


A normal red blood cell lives for about 120 days. It takes about two days for the body to manufacture each red blood cell, and about two million are turned out every second. Production of new red blood cells occurs in the bone marrow.