What is blood?


When you look at a cut, the blood looks like a red liquid, but it’s actually made up of billions of cells in a pale yellow colored fluid called plasma. There are three main types of blood cells in your body: Red blood cells, white blood cells, and platelets.



Red Blood Cells


  • Part of your body that carries oxygen to your organs and tissue and removes waste.
  • Red blood cells are the most needed blood component for transfusion.
  • They are often the difference between life and death for trauma victims and those undergoing surgery.
  • People with anemia, low hematocrit levels due to cancer or kidney diseases and sickle cell disease also need red blood cells.

White Blood Cells 


  • Your body is in a constant battle against invaders. Every day, viruses and bacteria may find their way into your body and can make you sick. White blood cells of various kinds spring into action to combat these invaders.



  • The cells in your blood that begin the clotting process.
  • They have a very short life span and can only be stored for five days after donation.
  • Due to this, there is a constant need for donors.

Why is blood important to the human body?

The blood in our bodies is pumped by the heart through a network of arteries and veins. The body depends on a steady supply of fuel and oxygen to reach its billions of cells. Blood also carries carbon dioxide and other waste materials to the lungs, kidneys, and digestive system; from there they are removed from the body. Without blood, we couldn't keep warm or cool off, we couldn't fight infections, heal wounds, and we couldn't get rid of our own waste products.
Blood Type

Four Categories: A, B, AB, O
Refers to the presence or absence of antigens on the red blood cells.
Your blood type is inherited.
Blood can be Rh factor negative or positive.
Rh factor is an inherited blood group on the red blood cells. 85% of people are Rh+.
Most common blood type: O+
Most rare blood type: AB-
Universal Donor O-
A person with O- blood can donate blood to anyone regardless of the recipient’s blood type.
Universal Recipient AB+
A person with this blood type can receive blood from anyone regardless of the donor’s blood type.