Blood
⭐ MasteredBlood carries oxygen and nutrients around your body. Red blood cells carry oxygen, white blood cells fight germs and platelets help clots form.
Your body contains about 5 litres of blood if you're an adult.
All about Blood
Blood is a liquid tissue that flows through your blood vessels. It carries oxygen, nutrients, hormones and waste products around the body. An adult has about five litres of blood.
Blood has four main parts: red blood cells carry oxygen, white blood cells fight germs and infection, platelets help blood clot when you are cut, and plasma is the pale liquid that carries everything else.
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Real-life uses of Blood
- Carrying oxygen from the lungs to your muscles
- Clotting to stop bleeding when you graze your knee
- Fighting germs when you have an infection
Frequently asked questions about Blood
What colour is blood inside the body?
Blood is always red. It looks darker when it has less oxygen, and brighter red when it is full of oxygen.
Why does a cut stop bleeding?
Platelets gather at the cut and form a clot, which seals the wound.
What are the different blood types?
Blood types such as A, B, AB and O are based on proteins on red blood cells. They are important when people need blood transfusions.