Blood Vessels
Science: Year 5 & 6 National Curriculum, topic 7.1.3
Blood Vessels
The blood is transported through blood vessels. There are three main types of blood vessels: arteries, veins and capillaries.
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Arteries
- Most arteries carry blood that is rich in oxygen.
- Arteries are thick to withstand high pressure.
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Veins
- Most veins carry blood with high levels of carbon dioxide.
- Veins have valves to stop blood from flowing backwards.
Capillaries
- Capillaries are really thin.
- Nutrients and gases can easily pass through the thin capillary walls.
Test yourself on Blood Vessels
What structures transport blood?
What gas is found in high levels in the blood that runs through most veins?
Which blood vessels allow nutrients and gases to pass easily through their walls?
What is correct about arteries?
What structure in the veins stops the blood from flowing backwards?