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Blood performs many functions essential to life and often can reveal much about our state of health.Blood is a connective tissue that consists of cells and cell fragments surrounded by a liquid matrix.Cells of the blood are formed elements.Plasma is the liquid substance in the blood.Plasma accounts for slightly one-half of the total blood volume.The average adult female has a blood volume of four to five liters.The average male has five to six liters.Blood makes up about eight percent of the total body weight.
Blood is important in the maintenance of homeostasis.It transports oxygen, nutrients, enzymes, and hormones to tissues, and transports carbon dioxide and waste products away from tissues.It maintains body temperature by transporting heat between deep tissues and the body's surface.It also protects the body from disease causing microorganisms, foreign substances, and tumors.
Plasma is the pale yellow fluid that consist of about ninety-two percent water and eight percent substances such as protein, ion nutrients, gases, and waste products.Plasma accounts for slightly one-half of the blood's volume.Proteins in the plasma are albumin, globulin, and fibrinogen.Albumin makes up about sixty percent of the plasma proteins.Globulin is part of the immune system and function to transport molecules.Fibrinogen makes up four percent of the plasma and is responsible for blood clotting.
Erythrocytes are disk-shaped cells with edges that are thicker than the center of the cell.During development, they lose all their nuclei and most of their organelles; so they are unable to divide.They live for about one hundred and twenty days in males and one hundred and ten days in females.The main component of an erythrocyte is the pigmented protein hemoglobin.Hemoglobin accounts for one-third of the cell's volume and is responsible for its red color.Erythrocytes function to transport oxygen from the lungs to the various tissues of the body and to assist in the transport of carbon dioxide from the tissues to the lungs.Hemoglobin is responsible for most of the oxygen transported in the blood.
White blood cells are spherical cells that are whitish in color because they lack hemoglobin.They are larger than erythrocytes and have a nucleus.Blood transports white blood cells to the other tissues found in the body.Leukocytes protect the body against invading microorganisms, and they remove dead cells and debris from the tissues by phagocytosis. Neutrophils are the most common type of leukocyte.They phagocytize microorganisms and the foreign substances.Basophils are involved in regulating the inflammatory response.They release histamine and other chemicals that promote inflammation.Basophils also release heparin, which prevents the formation of clots.
Blood is categorized by the ABO blood group system.ABO blood types are not found in equal numbers in the United States.Forty seven percent of white Americans have type O blood.Forty one percent have type A.Nine percent have type B, and three percent have type AB.A person who donates blood to another person is called a donor.The person who receives the blood is called a recipient.People with type O blood are referred to as universal donors, because they can give blood to the other ABO blood types.Type O blood can sometimes produce a transfusion reaction.If they mismatch blood groups other than ABO blood types and if antibodies in the blood of the donor can react with antigens in the blood of the recipient it will cause a transfusion reaction.Usually reactions like this are not serious.
Blood is needed to form many functions of essential life and often can reveal much about a person's state of health.Blood is the most important tissue in our body.Blood functions almost everything in our body.Without blood we could not live.
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