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
the backflow of blood
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 ________ ____
which carry blood away from the heart
which are tiny vessels whose walls are one-cell thick
which carry blood back to the heart
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
large surface area
in a capillary network, capillary walls are only ___ ____ thick.