Biology: Year 9 Term 3: The Circulatory System

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Name the 3 layers of an artery (3)
Endothelium, Smooth Muscle, Thick Outer Wall
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Why do arteries have thick walls? (1)
To withstand high pressure
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What is a capillary made of? (1)
A layer of endothelial cells
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Name the 3 layers of a vein (3)
Endothelium, Smooth Muscle, Thin Outer Wall
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What are the atria? (3)
Top chambers of the heart which receive blood from veins
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What are the ventricles? (3)
Bottom chambers of the heart which send blood to the arteries
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What is the purpose of the valves? (1)
To ensure blood flow in the right direction
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What is the septum? (3)
A muscle wall dividing the chambers to prevent oxygenated and deoxygenated blood mixing
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What are the adaptations of a red blood cell? (5)
Concave, No Nucleus, Haemoglobin, Small/Flexible, Large Surface Area
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What percentage of the blood do RBCs make up? (1)
40-45%
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What are the 2 types of white blood cells and what do they do? (4)
Lymphacytes make antibodies/antitoxins, Phagocytes engulf pathogens
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What percentage of the blood do WBCs make up? (1)
1-3%
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What are the adaptations of platelets? (3)
No Nucleus, Clot Well, Small
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What percentage of the blood do platelets make up? (1)
2%
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What is plasma? (2)
90% water liquid in which the blood cells 'float'
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What percentage of the blood does plasma make up? (1)
50%
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What is the equation for the circulation of oxygen? (2)
Haemoglobin + Oxygen -> Oxyhaemoglobin
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Other cards in this set

Card 2

Front

Why do arteries have thick walls? (1)

Back

To withstand high pressure

Card 3

Front

What is a capillary made of? (1)

Back

Preview of the front of card 3

Card 4

Front

Name the 3 layers of a vein (3)

Back

Preview of the front of card 4

Card 5

Front

What are the atria? (3)

Back

Preview of the front of card 5
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