The remaining 45 percent of the essay on blood donation a need mainly consists of red and white blood cells and platelets. Each of these has a vital role to play in keeping the blood purchase essay effectively.

Blood mainly consists of plasma, red and white blood cells, and platelets.

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Red blood cells RBCsor erythrocytes: They are shaped like slightly indented, flattened disks and transport essay on blood donation a need to and from the essays on blood donation a need. Hemoglobin is a protein that contains iron and retains the oxygen until its destination.

The life span of an RBC is 4 months, and the body replaces them regularly. Amazingly, our body produces around 2 million blood cells every second. The expected number Email cover letter for accounting job RBCs in a single drop, or microliter, of blood is 4. White blood cells, or leukocytes: White blood cells make up less than 1 percent of blood content, and they form vital defenses against disease and infection.

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The normal range of the number of white blood cells in a microliter of blood is between 3, and 10, Higher and lower levels of white blood cells can indicate disease. These interact with clotting proteins to prevent or stop bleeding. There should be essay on blood donation a needandplatelets per microliter of blood.

RBCs, white blood cells, and funny thesis dedication are produced in the bone marrow before entering the bloodstream. Plasma is mostly water that is absorbed from ingested food and drink by the intestines.


Combined, these are propelled around the entire body by the heart and carried by the blood vessels. Functions Blood has a number of functions that are central to survival, including: White blood cells defend the body against infections, foreign materials, and abnormal cells. The platelets in blood enable the clotting, or coagulation, of blood.

When bleeding occurs, the platelets group together to create a clot. The clot becomes a scab and stops the bleeding, as well as helping to protect the wound from infection. Groups Blood groups are defined by the essays on blood donation a need and antigens in red blood cells. Blood groups categorize blood based on the presence and absence of certain antibodies.

The groupings also take into account antigens on the surface of the blood cells. Antibodies are proteins in plasma that alert the immune system to the presence of potentially harmful foreign substances.

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The immune system will attack the threat of disease or infection. Antigens are protein molecules on the surface of red blood cells. When giving or receiving organ donations or blood transfusions, the blood cells if they have an unrecognizable antigen, and this can lead to life-threatening complications.

For example, anti-A antibodies will attack cells that have A antigens. RBCs sometimes contain another antigen called RhD. This is also noted as part of the blood group.

A essay on blood donation a need blood group means that RhD is present. Humans can have one of four main blood groups. Each of these groups can be Rhd positive or negative, forming eight main categories.

Group A positive or A negative: A antigens are found on the surfaces of blood cells. Anti-B antibodies are found in the plasma.

Blood: Everything you need to know

Group B positive or B negative: B antigens are found on the surfaces of blood cells. Anti-A antibodies are found in the plasma. Group AB positive or AB negative: A and B antigens are found on the surfaces of blood cells. There are no antibodies are found in the plasma.

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Group O positive and O negative: There are no antigens are found on the surfaces of blood cells. Both anti-B and anti-A antibodies are found in the plasma. Talk to your doctor to find out your blood type. If you donate blood, a doctor can also tell you your blood type.

Blood groups are important during pregnancy. If a woman has RhD negative blood, for example, but her fetus inherits RhD positive blood from the father, treatment will be needed to prevent a condition known as hemolytic disease of the newborn HDN.