What is is blood made up of?

Blood is made up of four main parts. These are: Red blood cells. These are nuclei-less cells packed full of haemoglobin to carry oxygen around the body. White blood cells. These are the immune system of the body, and protect the body from any invading pathogens.

Platelets. These are the cells that form scabs and clots when you get cut.

Plasma. This is the liquid part of the blood, and makes up around 60% of the blood content.