Blood circulation

Wording of this Handout:

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*Your body is made of about 100 million million cells

*There about the same number of cells in your body as there are stars in the Milky Way

*Most cells in your body are too small to see without a microscope

*Some nerve cells are joined into strings as long as a meter

*Before a baby is born its blood is different to the blood it has after it is born
*There are many different types of blood cell

*Blood cells which carry air do not have DNA

*Blood vessels lie close to each other so heat coming from the heart helps to warm colder blood coming back the other way

*During heat of great exercise blood vessels move towards the skin so heat is lost more easily

*Blood carries food and air to every cell in the body, and carries waste products away from all the cells

*Most of blood is water, and water carries heat well, so blood helps to keep us warm and also cool us

*God designed blood