We are all about blood in the Hub Lab, but relax it's not a big horror show! Phil is going to teach us about what is in real blood and help you make some DIY fake blood for Halloween costume.

What are we going to do in this Hub Lab
1. Understand what is blood and what jobs does it do.
2. Become familiar with the different parts of blood and make models of them.

So what is blood? Blood is like your internal delivery system. It's primary role is to take oxygen that you’ve inhaled through your lungs and with the help of the heart, bring it all over your body.

Adults have about five litres of blood whereas children have about 3. Blood has 4 main parts that we want to talk about. Red blood cells, white blood cells, platelets and plasma.

Red Blood Cells. In a single drop of blood there are about 5,000,000 red blood cells. So the same amount of people in Ireland roughly. Red blood cells carry oxygen around the body. They are the reason that blood is red because there are more red cells than any of the other types of blood cell. Blood is always red but it a different shade of red depending on whether it is carrying oxygen or not. They are shaped like bowl with a really thick rim.

White Blood Cells. There are about 12,000 white blood cells in a single drop of blood. Their job is to be part of our immune system and help fight off infections.  They are the biggest blood cell but also the fewest. There are a few different types of white cell but they all help fight infection. They come in different shapes and some look like furry golf balls.

Platelets. Platelets are not actually cells but parts of cells. There are about 200,000 in a drop of blood and their job is to stick together against one another when there is a break in a blood vessel like a cut. They help the blood clotting process and help form scabs so that your skin can heal after its been hurt. They have long stretchy almost limbs and are small.

Plasma is the yellowy clear liquid that all of the blood cells float in and makes up about half of the volume of the blood that you have! (You can make a model of the blood using mala!)

Make sure to keep sending your own home experiments to After School Hub: UPLOAD

Phil of Science's Hub Lab on After School Hub is having its own mid-term next week so catch up on the full show thanks to RTÉ Player.