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Know the Main Components of the Blood

Worksheet Overview

Image of blood composition

 

Did you know that your blood makes up about 7% of your total body weight?

 

Image of blood cells

 

The blood has loads of important jobs to do. Some of these include:

Transporting oxygen to our lungs

Transporting important nutrients to cells and tissues

Forming blood clots to prevent too much loss of blood

Fighting off bacteria and other pathogens to stop us from getting sick

Getting rid of waste products 

Regulating our body temperature

 

The blood is made up of four components: 

Red blood cells

White blood cells

Platelets 

Plasma

​Each of these components has a specific function. Let's explore these further.

 

 

Red blood cells (RBC)

 

Image of a red blood cell

 

 

Red blood cells give the blood its bright red colour. They contain a special protein called haemoglobin, which helps to collect oxygen from the alveoli in the lungs and deliver it to the cells around the body. 

Red blood cells have a biconcave shape (a bit like a doughnut) to give it a larger surface area – it makes it easier for oxygen to diffuse into the cell. Red blood cells don't have a nucleus, this makes room for more oxygen and also makes the cell more flexible, allowing it to fit through small vessels in the body. 

 

White blood cells

 

Image of white blood cell

 

Unlike RBCs, white blood cells contain a nucleus, so are much larger than red blood cells and are fewer in number. White blood cells protect the body from infection by engulfing invading pathogens. Some white blood cells produce something called antibodies, which attach to the surface of pathogens, helping to identify pathogens that need to be destroyed.

 

Platelets 

 

Image of platelets

 

Unlike red and white blood cells, platelets are not actual cells but fragments of cells. Their main function is to clot blood at the site of a wound to prevent further bleeding. The platelets end up forming a scab over the wound, which also prevents further infection by bacteria. 

 

Plasma 

 

Image of blood plasma

 

Plasma is the yellow liquid component of your blood. Its job is to carry the blood cells mentioned above, along with other substances such as waste products like urea, which is transported from the kidneys to the bladder. Small, soluble products of digestion produced by the small intestine also move around the body in the plasma.  

You could think of the plasma as the water that forms a river, and the cells as being the fishes, frogs and alligators that are transported by the river!

 

In the following activity, you will recall the main components of the blood and their functions.

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