Primary Science

What is Circulatory System?

What is the Circulatory System?

Circulatory System

The Circulatory System is our body’s delivery system. Our body cannot function as it cannot get the nutrients and energy needed to carry out daily activities without it. 

It transports oxygen, food and water to all parts of our body. It is made up of the heart, blood vessels and blood.

Our Circulatory system consists of: 

  • Heart – a muscle that pumps blood all over the body
  • Blood vessels (arteries, veins and capillaries) – Transport oxygen-rich blood away from the heart to the rest of the body (arteries) and carry blood to the heart from the rest of the body (veins )
  • Blood – is made up of many cells like red and white blood cells, plasma and platelets and carries nutrients and oxygen.

Some fun facts about our Circulatory System

  1. Do you know why our blood is red? That is because of the red blood cells (haemoglobin) found in the blood gives it its red colour!  
  2. Our blood vessels are very very long! If we were to lay out your entire blood vessels from end to end, it can go around the world twice! 
  3. There are about 5 million red blood cells in a single drop of blood!

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Here’s another Primary Science article for you: Respiratory System