Complete the text with the words from the list. There are TWO words you will not need.
Image (modified) : Termininja, CC BY-SA 3.0,
via Wikimedia Commons
Blood is an important part of the
system, which carries it to all parts of the body. The
pumps blood through big blood vessels called
and veins. In our body there are also millions of small blood vessels called
. Oxygen, food and other substances pass through the thin walls of these capillaries into the body's
.
When you inhale air,
passes through your lungs and and is picked up by
, which transports it to your whole body. It is released into cells and produce energy. In return, cells produce
dioxide, which enters your blood stream and is transported back to your
where it is exhaled.
Food also reaches different parts of the body by means of blood. It is digested in your
and important substances like fat, sugar,
, vitamins and minerals are separated. These nutrients enter the blood stream and are transported to the cells and
, where they are needed in order to give you energy or fuel. The work of the muscles and other tissue creates heat. Blood is the transporting system which carries heat throughout your body and warms you. The things that you don't need move to your intestines and
and leave your body again.
White blood cells play an important role in your
system. When harmful substances invade the body, an alarm goes off and white blood cells are activated. Then, they work to destroy the invaders. They fight off viruses, harmful
and begin anti-body production.
Blood also carries
to places where they are needed. They control growth, how the body uses food and other things.
We would bleed to death from a small cut if our blood didn't clot. When a blood
breaks,
rush to the damaged area and stick to one another , forming a plug.