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Copy and complete:
• The blood from the lungs enters the ______ ______. Then it gets moved down to the _______ _____. Then it gets squeezed out to the ______ _____.
• The blood from the body cells enters the _______ _______. Then it gets moved down to the _______ _______. Then it gets squeezed out to the _______.
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The heart as a pump
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The circulatory system
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ArteryThe blood vessel that carries blood away from the heart. They have very thick walls.
thick outer wall
thick inner layer of muscle and elastic fibres
narrow central tube (lumen)
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VeinThe blood vessel that takes blood into the heart. They have valves.
thin outer wall
thin inner layer of muscle and elastic fibres
wide central tube (lumen)
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ValvesWhen blood is flowing against gravity, or when a vein is squeezed by muscle action, there is a risk that blood will flow in the wrong direction. Veins have valves to prevent backflow.
blood to the
heart
backflow prevented vein valve
open
vein valve closed
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The heart as a pump
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The three types of blood vessels
• Arteries – take the blood away from the heart. They have very thick walls.
• Veins – take the blood into the heart. They have valves.
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CapillaryThe blood vessel that carries blood through the body cells. The wall is only one cell thick. They are extremely narrow and they connect the arteries to the veins.
wall only one cell thick
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• Capillaries – carry blood through the body cells. The wall is only one cell thick. They are extremely narrow and they connect the arteries to the veins.
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Blood vesselsvery thick wall
narrow tube
thin wall
wide tube
wall only one cell thick
ARTERY
VEIN
CAPILLARY
extremely narrow tube
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Blood vessels
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Compare & Contrast1. Thick walls2. Have valves3. Connect arteries to the veins4. Carry blood away from the heart5. Carry blood to and from the body cells6. Walls only one cell thick7. Thin walls8. Low pressure9. High pressure10.Carry blood into the heart