Term
Why do animals have a circularatory system? |
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Definition
| To transport substances quickly and efficiently, unlike diffusion which would be harder in larger animals. |
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Term
Why is water a good solvent? |
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Definition
Water is a transport medium because it is a good solvent.
It has uneven charge distribution. This means water is polar. |
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Term
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Definition
Right atrium-tricuspid valves-Right ventricles-semilunar valve-Pulmunory arteries-lungs-pulmunary veins-left atrium-bicuspid valve-left ventricle-semi lunar valve-aorta-body tissues-inferior/superior vena cava |
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Term
| Difference between superior vena cava and inferior vena cava. |
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Definition
Superior vena cava takes blood to head and brain.
Inferior vena cava takes blood to rest of the body. |
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Term
Double circulatory system |
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Definition
Blood is pumped twice.
Once-deoxygenated blood pumped to lungs
Twice-oxygenated blood pumped to the rest of the body. |
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Term
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Definition
The artery has a narrow lumen to transport blood under high pressure.
The thick walls help it to withstand the high pressure.
Smooth muscle alters diameter of lumen to vary blood flow.
Elastic fibres allows walls to stretch with blood is pumped through artery and recoil to smooth blood flow.
Valves are not needed.
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Term
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Definition
| The very thin wall allows rapid exchange between blood and tissues. |
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Term
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Definition
The wide lumen is to allow blood flow under low pressure.
The thin wall is because the blood flow will not damage the walls.
Very little smooth muscle and elastic fibres because there is no pulse of blood. No stretching or recoiling.
Valves to stop backflow |
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