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Introduction to the Human Circulatory System
Overview
• The circulatory system is made up of the heart and blood vessels.
• There are three types of blood vessels: arteries, veins, and capillaries.
ARTERIES
• Blood vessels that carry blood away from the heart are called arteries.
• They are the thickest blood vessels and they carry blood high in oxygen known as oxygenated blood (oxygen rich blood).
VEINS
• Blood vessels that carry blood back to the heart are called veins.
• They have one-way valves which prevent blood from flowing backwards.
• They carry blood that is high in carbon dioxide known as deoxygenated blood (oxygen poor blood).
CAPILLARIES
• The smallest blood vessels are capillaries and they connect the arteries and veins.
• This is where the exchange of nutrients and gases occurs.
A great partnership!
• Our circulatory system works with our respiratory system to supply our bodies with oxygen and nutrients. Together they are known as the cardiovascular system
How do they help each other?
• Our circulatory system carries waste products to the respiratory system which gets rid of wastes such as carbon dioxide.
• Our respiratory system brings in oxygen and our circulatory system delivers the oxygen to all the cells in the body.
The Blood
• Every time your heart beats, blood is sent through your body.
• Each day about six litres of blood is constantly circulated through your body.
• This blood travels through about 96,560 km of blood vessels!
Your Amazing Heart
• Your heart is a muscular pump that beats from 60 to 100 times per minute, but can beat much faster if it has to.
• That is about 100,000 beats per day, more than 30 million beats per year!
Cardiovascular Problems
• Problems with the cardiovascular system are common, but they don’t just affect older people.
• Many heart problems affect children and teenagers.