Blood is the red fluid that circulates in our blood vessels, i.e.veins and arteries. The main function of blood is to act as the body’s transport system, but it also has a major role in the body’s defense against infection. There is no substitute for blood. It cannot be made or manufactured. Donors are the only source of blood for patients who need it.

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Nearly half the volume of blood consists of cells, which include red blood cells, white blood cells, and platelets. The remainder is a fluid called plasma.

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Red cells, white cells and platelets are made in the marrow of bones, especially the vertebrae, ribs, hips, skull and sternum. These essential blood cells fight infection, carry oxygen and help control bleeding.

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Plasma is the liquid portion of your blood that transports water and nutrients to your body’s tissues.

red blood cells image

Red blood cells are disc-shaped cells containing hemoglobin, which enables the cells to pick up and deliver oxygen to all parts of the body, then pick up carbon dioxide and remove it from tissues.

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White cells are the body’s primary defense against infection. They can move out of the blood stream and reach tissues to fight infection.

According to AABB, the approximate distribution of blood types in the U.S. population (distribution is different for specific racial and ethnic groups):

O+ O+ percent 39%
O- O- percent 9%
A+ A+ percent 31%
A- A- percent 6%
B+ B+ percent 9%
B- B- percent 2%
AB+ AB+ percent 3%
AB- AB- percent 1%

40000 The national blood supply must cover every day needs and unexpected disasters. Frequent volunteer blood donors ensure that blood is ready (collected and tested) and available year-round whenever and wherever it is needed.

A common misunderstanding about blood usage is that accident victims are the patients who use the most blood. Actually, people who receive the most blood include those:

  • being treated for cancer
  • undergoing orthopedic surgeries
  • undergoing organ and marrow transplants
  • undergoing cardiovascular surgeries
  • being treated for inherited blood disorders

Every 2 seconds someone in the United States needs blood.

But that’s when blood centers see the greatest outpouring of support from donors.
Blood is needed everyday. You can help blood centers fill every request for blood by making sure it is available before it’s needed.

Included below are charts that breakdown the usage of both red blood cells and platelets with U.S. hospitals.
Blood _use _chart

Aabb _logo

Are you a blood recipient or blood donor? Share your story at info@bloodaddress.com

 William’s Story-


I was diagnosed with End Stage Renal Disease in January 2003 at the age of 49 and immediately began hemo dialysis and switched to peritoneal dialysis in March. In November of that year I received a kidney from my beautiful wife of 25 years Paula. Our daughter Jenae was a trooper and my greatest supporter throughout the entire ordeal. The transplant surgery required numerous blood transfusions. Paula is truly my soul mate! Not only did her blood type match she was also a 50% tissue match! Today I am in excellent health enjoying the gift of life thanks to blood donors and my soul mate. Share your story. >

Here are a few interesting statistics and facts about blood:

If you want to know more about blood biology, blood circulation, and the importance of blood in our bodies, you’ve come to the right place! My Blood, Your Blood is an award-winning science education program that teaches all about blood’s amazing journey through our bodies.

The program, made possible by a grant from The Foundation for America’s Blood Centers, was designed by a team of physicians and educators as a low-prep, turnkey package to be used either in the classroom or home-school environment. Through sophisticated microscopy,the My Blood, Your Blood program captures the imagination of students of all ages and helps foster an interest in science. The program also emphasizes the value of community service through blood donation and the importance of a healthy lifestyle.

Check out our playlist of video resources!

Elementary School Teacher’s Guide

Lesson Plans

Posters (Can be printed at 8.5 x 11 page or larger.)

MBYB Coloring Book

Middle and High-School Teacher’s Guide and Lesson Plans

Teaching Slides / PPT

Transparencies or Handouts / PDF


Elementary School Teacher’s Guide (Spanish)

Middle and High-School Teacher’s Guide (Spanish)