The Circulatory System

Substances like ____, ______ and ________ are carried around the body by the circulatory system. This consists of the _____ which pumps the blood and the blood vessels which carry the blood

the right atrium receives blood from the body via the ____ ____

the right ventricle pumps blood out into
the ________ _____ which carries it to the lungs

the left atrium receives blood from the lungs via the ________ ____

the left ventricle pumps blood out into the ____ which carries blood around the body.

The heart is a _________ ____

The heart muscles work by _________ and ________ again and again.

to ensure that blood does not flow backwards as the heart beats ______ are present in the heart

Valves prevent

The wall of the left ventricle is _______ than the wall of the right ventricle because the left ventricle has to pump blood all round the body. The right ventricle only has to pump blood to the _____.

The heart’s blood supply is made up of ________ ______ and ________ ____

arteries

capillaries

veins

When we feel a _____ in our wrist or neck it indicates that blood is flowing through an ______.

Blood consists of _____ _____ and ______ ______

Red blood cells transport ______ around the body

Plasma transports _________ _____ and ______ ______

Red blood cells are red because they contain a red pigment called ___________

haemoglobin carries ______ around the body from the _____ to all of the _____ ____

In the lungs haemoglobin combines with oxygen to form _______________

When the blood reaches the body’s cells the oxyhaemoglobin breaks down again to ______ and ___________.

The cells of our bodies are constantly using up ______ and producing _______

Gas exchange between the blood and the cells of the body takes place when __________ come into close contact with the _____. ______ passes from the blood into the cells. ______ passes from the cells into the blood.

exchange occurs very _______ and _________ between blood and the body cells

a capillary network has a _____ _______ ____, which means that every body cell is close to a capillary

in a capillary network, capillary walls are only ___ ____ thick.