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www.reference.com/article/white-blood-cells-come-159594e517b0b403

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.

www.reference.com/article/white-blood-cells-57dd5beef73eb53f

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.

www.reference.com/article/long-red-blood-cells-live-f32452136131161a

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.

www.reference.com/article/large-red-blood-cells-symptom-cancer-fa5d81e07c36fdfc

Large red blood cells, called macrocytosis, are not a cancer symptom but may signal a problem that needs to be examined medically, explains Mayo Clinic. Macrocytosis is not a disease and does not produce symptoms or signs. Vitamin B-12 or folate deficiencies, liver disease, hypothyroidism and alcoho

www.reference.com/article/increase-white-blood-cells-3e3b2420dd28d8c6

According to Oncology Nutrition, high-quality protein can aid in increasing an individual's white blood cell count since the amino acids derived from protein are an essential part of creating new white blood cells. A person who has the condition known as neutropenia should avoid food that is expired

www.reference.com/article/causes-high-blood-cell-counts-dc38cb007937bf90

High blood cell counts can be a result of a condition that increases the bone marrow's production of white or red blood cells, according to Mayo Clinic. White blood cell production increases when the body needs to fight an infection or as a reaction to an immune system disorder or certain medication

www.reference.com/science/functions-white-blood-cells-63a18a771a2dcf5e

The main function of white blood cells is to help protect the human body from infection as well as other foreign materials. White blood cells are also known as leukocytes, and they develop in bone marrow from stem cells.

www.reference.com/science/red-blood-cells-specialized-82bbe77037c57d32

According to Springfield Technical Community College, the primary role red blood cells play in the body is to transport oxygen from the lungs to the various body tissues. To carry out this task, the cells are filled with a substance called hemoglobin. Hemoglobin is so important to red blood cells th

www.reference.com/article/low-white-blood-cells-mean-c6a677fcd89339fe

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.

www.reference.com/article/good-white-blood-cell-count-922405cc85c0b63b

When a person has a good white blood cell count, it means his body produces between 4,500 and 10,000 white blood cells per microliter, according to WebMD. White blood cells are used to protect the body against harmful organisms.